GENERAL INDEX 537 
VALVE, ileo-colic, 449 
» of Vieussens, 48 
Variation in dominant races, 21, 88 
es meristic, in spinal nerves, 154, 387 
Veins, forming vertebrate heart, 180 
Velum, 228, 289, 298, 302 
Vertebrates, alimentary cana], innervation of, 446 
rr atrial cavity, 410 
33 auditory apparatus and lateral-line system, 356 
45 body-cavity, 401, 480 
“i brains, 40 
$9 branchial organs, 151 
a ccelomic cavities in head region, 251, 266 
49 cranium, evolution of, 342 
* egg of, 483 
“ evolution of, 11 
5 excretory organs, 389, 391, 408 
a glands, ductless, 418 
F i internal secretion of, 215 
“3 heart, 175, 179, 180 
3 muscles, evidence of segmentation of eye, 248 
ii i oblique, 278 
- 5 origin of somatic trunk, 406 
a nervous system, central, 13 
is nerves, segmental, 152 
a notochord and gut, 434 
a organs of, 10 
i origin of, 9, 411, 433, 457 
segments, prosomatic, 257 
x5 skeleton, commencement of bony, 120, 458 
9 spinal cord and medulla oblongata, 44 
re spinal region, 385 
3 thyroid, connection between generative organs and, 215 
5 tubes, meeting of four, 318, 440 
Vesicles, cerebral, formation of, 48, 458 
Vitellophags, 471, 483 
Volvox, 479 
WOLFFIAN BopDy, 390 
XipHosura, 24, 26, 249 
Your, 482 
THE END 
