INDEX 



471 



(Amphioxus, pages 1-G1; frog, 62-228 



ventricle (cerebral), 131, 132, 133: 



304, 305, 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., 



384, 385, 386, 390, 399; 



cerebral, 25, 35, 38 ; - - meso- 



nephric, 198 ff., 199, 200 ; 

 optic, 144, 145, 147 : 266, 271, 274, 

 276, 282, 283, 303, 316^., 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^.: 404 ff., 404, 

 406, 408 ; - - cartilaginous, 



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



see gill clefts; 



pouches, 122, 



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



328 ff., 329 

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



233,245, 247, 287: 374 

 viteUus, 232, 233 

 vitreous body, 148: 320 



Wall, body, 282 _ 



weasel, placentation, 440 



Weber, 177 



weight, of human embryo, 411 



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



whale, placentation, 440 



Willey, quoted, 2, 50 



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

 335, 357, 358, 359, 360; - - duct, 

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

 356 ff, 357, 359, 360 



Xiphisternum, 221 



Yolk, influence upon development, 

 230; - - mass, later history, 289 

 ff.; - - white and yellow, 233, 

 233,239,239,- - nucleus, 74, 75 : 



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^.; - - meso- 



derm of, 425, 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 



