Crucibulum spinosum
Crucibulum spinosum, common name the spiny cup-and-saucer snail, is a species of sea snail, a marine gastropod mollusk in the family Calyptraeidae, the slipper snails and cup-and-saucer snails. Description
The shell has a width of 44.6 mm. Distribution
This species is native to the west coast of the Americas, from California to Chile. It has been introduced and established in Hawaii. References

 Lesson R.P. , 1831 Histoire naturelle des Mollusque, Annélides et Vers recueillis dans Voyage autour du monde exécuté par ordre du roi sur la corvette de S.M. La Coquille pendant les années 1822, 1823, 1824, et 1825, sér. Zoologie, vol. 2(1), p. 471 p., 16 pls

External links
 http://www2.bishopmuseum.org/HBS/invertguide/species/crucibulum_spinosum.htm

Calyptraeidae
Gastropods described in 1824
Taxa named by George Brettingham Sowerby I