402 INDEX. 



Veins, jugular, pig, 12.0 mm., 268 Vesicles, ammo-cardiac, 87 



20. o mm., 314 chick, 180, 186 



lateral cardinal, 265 cerebral, origin, 71 



of the head, 268 optic, origin, 71 



lingual, 279 segmental, 86 

 omphalo-mesaraic, chick, 178, 180, 190, Villi, branching, 367 



191, 208, 210 histology of, 356 



origin, 93 of allantois, 253, 324 



primitive arrangement of, 98, 103 of chorion, 367 



ophthalmic, 271 shape of, 367 



peripheral (of limb), 320 vessels of, 370 

 portal, pig, 9.0 mm., 252 



12.0 mm., 290 Weigert's hematoxylin, 384 



posterior cardinal, origin, 103 Weismannism, 29 



pulmonary, 285 Wolffian body, general account, 109 



subcardinal, 256 pj g> g mm _ 252) 256 



superior longitudinal sinus, 265 120 mm 287 



mesenteric, 311 x 7 mm | 3o6 



umbilical, origin, 104 2O o mm _ 322 



pig, 9.0 mm., 257 duct, chick, 212 



12.0 mm., 289 tubules, origin, 86 

 17.0 mm., 311 

 vitelline, pig, 9.0 mm., 253 



1 7 . o mm., 3 1 1 Yolk - Absorption of, 65 



Velum transversum, origin, 74 D ' cavit y> 53 



Vena capitis lateralis, 268, 299 Yolk-sac, angioblast of, 66 



cava inferior, 300 entoderm of, 64 



development, 257 formed b y splanchnopleure, 82 



hepatica communis, pig, 9.0 mm., 252 S eneral morphology, 63 



Venous system, 102 human ' 66 



Ventral roots, 270, 283 structure, 375 



Ventricle, fourth, pig, 6.0 mm., 246 m umblhcal cord - 374 



12.0 mm., 293 mesoderm of, 66 

 lateral, pig, 12.0 mm., 275 



20. o mm., 327 . Zimmermann's arch, 101 



of heart, pig, 12.0 mm., 282 Zona pellucida, 34 



Vertebrae, pig, 12.0 mm., 303 radiata, 34 



17.0 mm., 304 Zones, dorsal, 72 



20. o mm., 314, 315 of His, 72 



24.0 mm., 337 parietal, defined, 84 



Vertebrate type, 2 . segmental, 178, 193, 213 



fundamental characteristics of, 3 defined, 84 



modifications of, 7 ventral, 72 



