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Valve of Vieussens, of birds, 369; of mammals, 370 Vagina mammalia, 415 Vagus nerve (see Tenth nerve) Vasa efferentia and recta mam- malia, 414 Vascular system of chick, 224— 230; of second day, 89—94, 102 485 —106 ; of third day, 167—170; mammalia, 406—413 Vascular area: of blastoderm of chick, 27; of third day, 110o— 113; of rabbit’s ovum, forma- tion of, 326 Vas deferens: of cock, 224; mam- malia, 415 Velum medulle anterius (see Valve of Vieussens) ; posterius, 37° Vermiform appendix, mammalia, 41 ed cava, inferior, of chick, 228, 285—290; mammalia, 4og— 413 Ven cave, superior, of chick, 286—290; of mammalia, 409 —4I Vente Tindnentes of chick, 227, 287—289; revehentes of chick, 227, 287—289 Vena terminalis (see Sinus termi- nalis) Venous system: of chick, 226— 229, 283—290, 301303; mam- malia, 409—413 Ventricles of brain of chick of second day, 102; of mammals, 117, 121—122; of chick, 229 Ventricular septum, chick, 230, 25 sets bare of chick, primary, 205 —208; permanent, 205—208; bodies of, 207—209 Vertebral arches, osseous, of chick, 207, 210; mammalia, 409 - Vertebral artery of chick, 295— 298 Vortsbel column, of chick, 205— 208; membranous, 205—208; secondary segmentation of, 205 —208 ; explanation of do., 205 —206 ; of mammalia, early de- velopment, ossification of, 400, 401 Vertebrate animal, general struc- ture of, 39 Vesicle of third ventricle (see Thalamencephalon) 486 Vessels of placenta, 360—363 Vestibule, chick, 158 Villi: of human ovum, 335; of zona in dog, 347; of subzonal membrane of rabbit, 347; of chorion of mammal, 349; of placenta, 360— 363 Visceral arches, 245; of rabbit, 334 Visceral arches of chick, 162—167; of rabbit, 334; of mammalia, 402 Visceral clefts: of chick, 162— 167, 281; closure of do., 164; of rabbit, 334; of mammalia, 402, 418 Visceral folds of chick, 163 Visceral skeleton of chick, 242 —246 Viscatal vein of chick, 284—290 ; of mammalia, 4o9—413 Vitellin, 5 Vitelline arteries: of chick, 167, 293—298, 225; of second day, 89, 103 Vitelline duct of chick, 196, 232; of mammals, 350 Vitelline membrane, 4; of hen’s egg, 13—15; of mammal, 310 Vitelline veins of chick, 84, 226. 288—290; of second day, 92, 104; 1n rabbit, 343; of mam- malia, 410—413 Vitreous humour of chick, 140, 150 INDEX. Viviparous animals, 308 Vomer of chick, 246 Ww White matter: of spinal cord of chick, 252; of brain of mam- malia, 386—387 Wings of chick, 200 Wolffian body: of chick, 190— 193; of mammalia, 414; of chick of second day, 106 Wolftian duct of chick, 190, 213; of second day, 94—95, 106; of mammalia, 414 Wolffian ridge of chick, 198 Wolffian tubules of chick, 106, (91193, 213 Y Yolk of hen’s egg, 4—7; arrange- ment of, 6; structure of, 5 Yolk-sac: of chick, 28—37, 277— 280; of mammals, 327; of marsupials, 352; of rabbit, 353; of human ovum, 355—358; of dog, 358 Z Zona radiata, 310; of chick, 15 Zonary placenta: histology of, 360; derivation of, 364 CAMBRIDGE: PRINTED BY J. & cr. CLAY, AT THE UNIVERSITY PRESS. fate aii maint eli pl ar peueehyrutaiiitaetae it it Pe ey Peg eet ete et aang Heed oa fratello tall | batt ifs 2 tf Pallet iti 4 t inh i ae re i ier tcaaeh linia Ate ip cetel ats Se Sees SSeS SSE eet aoe a ae i Gays oo Sener Ee oa ari = Shes Sots See Se nic, Pane St halts [asia a Sr. be Hh iui Cua i dash prea Mel. 