512 MR. W. HARPER PEASE ON NEW MARINE SHELLS [June 27, 

jngum obsoletis ; mucrone postico, elevato : intus lam . insert. 
v.-, ant . viii.-x-., post . xii.-xiv.-, nnijissatis ; dentibus v. 

solidis, declivibuSy reliquis acutioribus 9 omnino pectinatis ; 
subgrundis latioribus, curtis ; sinu latiore 9 denticulato ; pallio 
squamulis subpilulosis copiose induto. 

Long, -48, lat. *25, alt. '07 poll. 

Hub. Society Islands (Pease) (no. 298). 

This curious little species, with the aspect, but not the posterior 
insertion-plates, of Onithochiton 9 is closely related to confossus , Gld. 
The details of sculpture, however, do not agree ; and the U. S. Expl. 
Exp. species is said to have nine posterior and twenty-five anterior 
insertion-plates, in addition to which the artist has (probably for 
uniformity’s sake) sketched five on each of the central valves! The 
plates are those of Acanthopleura , but the mantle is scarcely bristly, 
the minute hair-like scales being more akin to those of Leptochiton. 


2. Descriptions of New Genera and Species of Marine 
Shells from the Islands of the Central Pacific. By 
W. Harper Pease, of Honolulu, Corii. Memb. (Com- 
municated by P. P. Carpenter.) 

Genus Libratula, Pse. (Family Galeommidae.) 

T. cequivalvis 9 valvis planis 9 semilunaribns 9 7nedio ligamento junctis; 
margine cardinali recto , serrato . 

Like Galeomma ; but with the valves flattened as in Placuna , and 
without the ventral gape. They lie wide open. 

Libratula plana. 

L. t . parva 9 cequilaterali , a Ibid a ; valvis leevibus , marginibus 
temnbus ; lamina cardinali subprominente , subtilissime serrata ; 
umbonibus mediants , parvis 9 contiguis . 

This singular creature was found living on coral. When at rest, 
the valves are perfectly horizontal, and so closely connected that it 
has the appearance of, and may have been heretofore mistaken for, 
au operculum. The animal does not extend beyond the shell. 
When in motion, however, it protrudes a round lobe to a distance 
as great as its own length, by which it draws itself along, at the 
same time depressing its valves to an angle of about 90°, and raising 
them again when reaching the end of the lobe. This motion of the 
valves is so rapid that, without observing closely, the progress of the 
animal might be supposed to depend on it altogether. It is very 
active in its habits — a rare thing among bivalves — in this respect re- 
sembling Solemya . 

Mitra saltata. 

M. t. parva, fnsiformiy snbulata , tenui , nitida , pellucida 9 cornea ; 
basi subtruncata 9 transversim striata 9 longitudinaliter subti - 


1865.] FROM THE ISLANDS OF THE CENTRAL PACIFIC. 513 

Itssime striata; anfractibus plants sett subconvexis, marginatis; 
columella, tri- seu quadriplicata, plicis obliquis ; apertura am- 
pliore, dimidium longitudinis testa; aquante ; labro tenui 

Loug. -3, lat. *09 poll. 

This elegant little species was found living in the hollows of coral- 
rock. When disturbed, the animal would skip 5 or 6 inches in a 
horizontal line, from one side of the cavity to the other, at the same 
time spinning out a very fine web. When held in the hand, it would 
jump off, suspending itself by a thread to a distance of 2 or 3 feet*. 

Engina fusiformis. 

E. t. fusi/ormi, utrinque attenuata, medio angulata, basi con- 
tracta, canali recurvata, spira acuminata, longitudinaliter 
nodoso-costata, transversim sulcata et striata; anfractibus 
superne parum concavis ; columella superne subexcavata et pli- 
cata ; nigra, luteo irregulariter maculata et fasciata ; aper- 
tura dimidium longitudinis testa aquante, purpureo-rufesccnte 

Long. -6, lat. -34 poll. 

Engina ovata. 

E. t. abbreviato-ovata, utrinque acuta, basi parum recurvata • 
longitudinaliter costata, transversim nodoso-lirata et striata’- 
apertura superne regulariter arcuata, infra contracta ; nigra 
lirarum mterstitiis albis vel pallide luteofuscis, denticulis 
apertura albis. 

Long. -5, lat. *32 poll. 


Nassa obliqua. 


N. ?• crassa , solida, oblique globoso-ovata, transversim nodoso- 
lirata ; nodis parvis, compressis, longitudinaliter oblique costu- 
lata, et striis rugata ; spira curia, acuta; anfr. superne con- 
cavo-mdentatis ; apertura parva, oblique ovali ; columella Icevi, 
excavata ; callo amplo, incrassato, spira tenus extenso ; labro 
calloso, intus lirato ; pallide fulva, liris transversis castaneis, 
nodis albidis ; apertura et columella aurantiaco-luteis ; callosi- 
tate albida. 

Long. 14, diam. 12 mill. 

Coralliobia sculptilis. 


C. t. alba, valde depressa, planulata, ovata; labro continuo, ex- 
panso, radiatim costulato ; spira minima, in labro inclusa ; lon- 
gitudinaliter imbricatim laminata, transversim costata, costis 
tribus rotundatis ; labro radiatim costulato ; canali brevi an- 
gusta. * 

Long. 9, diam. 7 mill. 

This elegant little species, of a rare genus, was brought up on 
coral from a depth of 90 fathoms. y 


* .^ rom the lar ge size of the nuclear whorls, which are seldom 
Mitrids, it is probable that this delicate little shell is not mature.- 


seen in adult 
P. P. C. 


514 MR. W. HARPER PEASE ON NEW MARINE SHELLS [June 27, 


Torinia CONICA. 

T. t . conica, elevata, ad peripheriam obtuso-angidata , concert - 
trice sulcata et creberrime striata; sulcis tribus y punctulatis y 
longitudinaliter vix oblique insculpta ; umbilico angusto ; aper- 
tura subcirculari ; albida, irregulariter pallide purpureo vel 
cinereo strigata et maculata . 

Alt. 10, diam. 10 mill. 

Turricula putillus. 

T. t . abbreviato-fusiformi, subventricosa , sulcis angustis decus- 
sata, sulcis longitudinalibus tcnuiter striatis ; spira breviuscula , 
acuta , suturis vafde impressis ; apertura intus valde hrata y 
labro denticulato ; columella quadriplicata ; nigra , spira et 
anfractu ultimo superne albo maculatis , interdum fascia inter - 
rupta alba cingulatis y sulcis transversis rufo-fuscis. 

Long. 10, diam. 5 mill. 

The shell has some of the characters of Mitra alveolus , Rve. 

Genus Mitroidea, Pease. 

Testa mitriformis ; columella multiplicata ; antice valde truncata . 

Mitroidea multiplicata. 

M. t. oblonga y subfusiformi, solida y transversim tenuiter striata ; 
spira brevi y acute acuminata ; basi truncata ;* columella pro - 
ducta , recurvata , subcontort a ; labro shnplici , intus Icevi, extus 
incrassato, subvaricoso ; apertura angusta y longissima , duobus 
trientibus longitudinis testce adcequante y antice vix dilatata ; 
columella decemplicata y plicis confertis y regularibus y vix obli- 
quis ; albida y epidermide tenui straminea induta y lineis casta- 
nets distantibus cingulata . 

Long. 25, diam. 9 mill. 

This very remarkable little shell differs from all other known Mi- 
trids (1) in having ten plaits crowded on the anterior half of the 
pillar-lip, and (2) in having the base truncate, in a manner some- 
what approaching Terebellum , beyond which the projecting columella 
is somewhat recurved. 

Mitra nigricans. 

M. t. fusiformi y elongata , laevigata , transversim tenuiter striata y 
striis subdistantibus punctatis ; epidermide tenui induta ; spira 
gracili y elongata , acuta; labro simplici ; columella quadripli- 
cata ; nigrescente y fascia angusta castanea cincta; apertura 
plumb ea. 

Long. 20, diam. 7 mill. 

Neritina rubida. 

N. /. oblongo-ovata y tenui y striis incrementi rugidosa; spira 
parva ; area columellari lcevi y cinerea ; fusccscenti-rubida . 

Long. 5, diam. 3 mill. 


515 


1865.] FROM THE ISLANDS OF THE CENTRAL PACIFIC. 

This species may be compared with N. succinea , inhabiting the 
West Indies. 

Eulima subpellucida*. 

E. t. dong at a, pyramidali , alba, nit Ida, subpellucida. , polita, 
tenuiore, apice submucronato ; anfr. ix., plano-convexis, vix 
tenuiter decussato-striatis , ultimo ventricoso, ad peripheriam 
subangidato ; suturis subimpressis, marginatis ; apertura elon - 
gato-ovata ; labro tenui . 

Long. 16, diam. 7 mill. 

Purpura marmorata. 

P. t . oblongo-ovata, solida , spira acuminata , acuta, conica ; anfr . 
transversim imj)resso-striatis, infra suturas vix concavis, ultimo 
medio biseriatim, spira uniseriatim tuberculatis, tuberculis 
compressis ; anfr. ultimo infra biseriatim obsolete noduloso ; 
apertura supra subcanaliculata , intus lirata ; albicanti-rubra, 
fusco marmorata . 

Long. 50 mill. 

This form is allied to P. mancinella . 

Cypr^ea fusco-maculata. 

C. t . oblongo-ovata, vix umbilicata, latere dextro subangidato, 
margmato, extremitatibus productis ; apertura subflexuosa, 
a7iyusta, dentibus parvis; albicante, ad dorsum irregulariter 
casta?ieo fusco picta , lateribus fusco punctatis , extremitatibus 
maculis casta?ieofuscis consjncue ornatis . 

Long. 13, diam. 7 mill. 

We have a number of specimens of the above species in our col- 
lection from different localities, all of them more or less worn. It is 
allied to “ O . goodalliif from which the spots on both sides of the 
extremities serve to distinguish it ; they are conspicuous and never 
absent, even on those most weathered. 

Cypr^ea Candida]". 

C. t . oblongo-ovata, omnino alba, lateribus subincrassatis rotun- 
datis , basi rotundata ; extremitatibus vix productis , subre- 
flexis ; longitudinaliter tenuissime striata ; apertura subflex- 
uosa , dentibus fortibus sub dist antibus instructa, interstiis pro- 
funde incisis. 

Long. 15, diam. 8 mill. 

Planaxis abbreyiata. 

P. t. ovata , solida, pnrp'ureo -nigrescent e, intus purpurea; spira 
brevi , acuta; suturis bene impressis ; anfr * v., convexis, spira- 
liter striatis, striis inter dum in medio anfr actus ultimi evanes- 
ccntibus ; apertura ovata, sup erne sid cat a ; labro margine in - 

* = Stylifer pyramidalis, Pse., MS. ; allied to Eulima pyramidalis , A. Ad. 

f Not to be confounded with Trivia Candida. — P. P. C. 


516 MR. W. HARPER PEASE ON NEW MARINE SHELLS. [.June 27, 

ter no crenulato ; labio superne calloso, Icevi ; canali brevissima ; 
basi spiraliter sulcata. 

Long. 10, diam. 6 mill. 

= P. buccinoides, Pse., a prima manu, nom. prseoc. 

PeDICULARIA PACIFICA*. 

P. t. tenuiuscula, oblonga, irregulari, in medio contracta , radiatim 
striis elevatis ornata, striis concentricis decussata, apice con- 
spicuo involuto ; rubida, interdum omnino violacea vel cornea. 
Long. 7 mill. 

The following list of synonyms, drawn out from a careful compa- 
rison with the Cumingian Collection, and with the types described 
in Dr. Gould’s * Otia,’ which happened fortunately to be temporarily 
in my possession, may be useful to those who have received the shells 
under Mr. Pease’s MS. names. — P. P. C. 

Atys debilis appears to be identical with A. succisa, Ehr., and 
simply a slender variety of A. alicula, A. Ad. 

Fissurella granifera, Pse., is a good species of Glyphis. 

Rimula fenestrata, Pse., is a very young Glyphis. 

Conus fusi/ormis, Pse. (= C. pusilla, Pse., olim), is a small species 
of Conella, Swains. 

Daphnella bella, Pse., belongs to one of the Columbelloid genera, 
probably to Anachis. 

Cithara costulifera, Ps e.,= Anachis atomella, Sby., var. 

C. varia, Pse., is probably an Anachis : = Columbella virginea, Gld. 
(from type). 

C. garrettii, Pse., is a Mitrella. 

Borsonia corrugata, Ps e..,—{Clathurella) nebulosa, Pse. (teste H. 
Cuming). 

Torinia corrugata, Pse., = T. variegata, Lam. (teste H. Cuming). 

Natica undulata, Pse., appears to be the young state of the Pacific 
variety of N. tnaroccana, Chemn. 

Na'ssa plicata, Pse., is a dwarf, strongly sculptured variety of N. 
olivacea, Brug. (teste H. Cuming). The characters of the mouth 
exactly agree. 

N. microstoma, Pse., is a white variety of N. dermestina, Gld. 

N. turricula, Pse., and N. unifasciata, Pse., appear to be varieties 
of N. paupera, G\d. ,=plebecula, Gld. (from types). 

Columbella pellucida, Pse., is probably a Nitidella {ox Mitrella). 

C. fiammea, Pse., belongs to the same section : it appears to be a 
variety of C. tceniata, Ad.&Rve. (non Phil.). C. lineolata, Gld., and 
C. decolor, Gld., are conspecific, (teste type specimens in Mus. 
Smiths.). 

Columbella, sp. ind. (like australis), Ps e., = C. araneosa, Gld., 
var. It belongs to Amycla. 

* This shell, when first examined by Mr. Cuming, was pronounced to be a va- 
riety of P. sicula. Similar forms have been found on both sides of the North— 
American continent. — P. P. C. 


1865.] MR. G. B. SOWERBY ON SCINTILLAS AND A PYTHINA. 517 

C. sagitta , Gask., is also an Amycla . In Mr. Pease’s series of 
specimens, the arrow-pattern gradually passes away. 

Sistrum seminodosutn, Ps z. 3 =elatutn f Blainv., var. 

Mitra brunnea, Pse., = Strigatella fuscescens , Pse., var. (teste H. 
Cuming). 

M. tessellatciy Pse., = 3/. puella , Rve. (teste H. Cuming). 

Triton crenulatus, Ps e. y =^Epidro?nus antiquatus, Hds. 


3. Descriptions of Four New Scintillas and One New Py- 
THINA FROM THE COLLECTION OF Mr. H. CUMING. By G. 

B. Sowerby, F.L.S. 

(PI. XXXII.) 

Scintilla semiclausa. PI. XXXII. f. 1, 2 . Testa oblongo - 
subquadrata , subventricosa , paulo obliquata , succinea , ad mar - 
ginem ventralem clausa ; lateribus vix hiantibus; apice acnmi - 
nato ; latere antico breviore et angustiore . 

Hab. Borneo (Mus. H. Cuming ). 

Less obtusely angled on the anterior side than S. succinea , and 
deeper than S . crocea. 

Scintilla lactea. PI. XXXII. f. 4. Testa oblique ovalis , 0 / 60 , 
clausa , subventricosa , latere postico subextenso . 

Borneo (Afw$. //. Cuming ). 

More oblique and less obtuse at the sides than & lagardi. 

Scintilla rosea. PI. XXXII. f. 5, 6 . 7^0 ovali-oblonga, 

compressa , rosea, antice subacuta , breviuscula , postice lata 
rotundata ; rnargine ventrali expanso . 

# 06 . Lizard Islands (Mus. H . Cuming ). 

More expanded at the ventral margin, and more pointed anteriorly, 
than S. pudica . 

Scintilla oblonga. PI. XXXII. f. 3. Testa pallide straminea , 
oblonga , lateribus subquadratis, marginibus dorsalibus et ven- 
tralibus rectis. 

Hab . Borneo (Aiws. Cuming ). 

More quadrately oblong than <S\ and similar species. 

Pythina striatissima. PI. XXXII. f. 7. Testa pallide stra- 
minea , divaricatim striata ; complanata , subtrigona, 

marginibus latero-dorsalibus declivis, margine ventrali rectius- 
culoy medio vix sinuato. 

Hab . Borneo (A/ws. #. Cuming ). 


