INDEX 



471 



(Amphioxus, pages 1-61; frog, 62-228 



ventricle (cerebral), 131, 132, 133: 



304, 306, 306, 307 

 vertebrae, 208-209: 354; table 



of, 173 

 vertebral plate (mesoderm), 170, 



194:263, 278 

 vesicle, amnio-cardiac, 252, 267, 273; 



blastodermic, 382 383 ff., Xiphisternum, 221 



chick, 229-367; mammal, 368-454.) 



whale, placentation, 440 

 Willey, quoted, 2, 50 

 Wolffian, body, 198 ff., 199, 200: 

 336, 357, 358, 359, 360; duct, 



199, 199, 202 ff.: 265, 294, 355, 

 356 ff, 357, 369, 360 



384, 385, 386, 390, 399; 



cerebral, 25, 35, 38; meso- 



nephric, 198 ff., 199, 200 ; 



optic, 144, 146, 147 : 266, 271, 274, 

 276, 282, 283, 303, 316 jf., 317, 318, 

 329 ; seminal, 73 : 202 



villi, 400, 438 ff., 442, 444, 445 ff., 



447, 448, 449 ; fixation, 442, 



447, 448, 449; of human 



placenta, 442, 444, 445 ff., 449 



visceral, arches, 120, 123, 160, 160, 

 163, 164 : 286, 328 ff. : 404 jf., 404, 



406, 408 ; cartilaginous, 



211, 216 ff., 217, 218 ; clefts, 



see gill defts; pouches, 122, 



158, 160, 160, 163, 164 : 269, 278, 

 328 jf., 329 



vitelline membrane, 4, 5, 8: 69: 232, 

 233,245,247,287: 374 



vitellus, 232, 233 



vitreous body, 148: 320 



Wall, body, 282 



weasel, placentation, 440 



Weber, 177 



weight, of human embryo, 411 



Yolk, influence upon development, 



230; mass, later history, 289 



ff.; - white and yellow, 233, 



233, 239, 239, nucleus, 74, 76 : 



376; plug, 65, 99, 101, 102, 



120; sac, 286 ff., 287, 288, 



289, 310, 348: 428, 430; sac, 



circulation, 290, 291 : 432-433,432 ; 



disappearance of, 292, 



300; endoderm, 256, 272, 



277, 289-290: 390, 391, 425, 431; 



human, 399, 400, 402 



ff., 444 ; later history of, 



292, 300: 431 ff.; meso- 

 derm of, 426, 432; septa 



of, 287, 288, 289 ; um- 

 bilicus, 287, 288, 288, 289 ; 



stalk, 282, 287, 288, 289, 289, 335, 



348 : 402, 408 ; human, 



431,433,444; umbilicus, 



402 



Zona, pellucida, 373, 374, 376, 384 ; 



radiata, 239, 239 : 374, 376 



Zone of junction, 247, 258, 277, 277 



