INDEX 



471 



(Amphioxus, pages 1-61; 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 ff.: 404 ff., 404, 



406, 408 ; cartilaginous, 



clefts, 



211, 216 jf., 217,218; 



see gill clefts; pouches, 122, 



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



328 ff,, 329 

 viteUine 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 



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 



""., 444 ; later history of, 



~2, 300: 431 ff. ; - 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 



