

GENERAL INDEX 537 



Valve, ileo-colic, 449 



,, of Vieussens, 48 

 Variation in dominant races, 21, 88 



„ meristic, in spinal nerves, 154, 387 

 Veins, forming vertebrate heart, 180 

 Velum, 228, 289, 298, 302 



Vertebrates, alimentary canal, innervation of, 44G 

 ,, atrial cavity, 410 



auditory apparatus and lateral-line system, 356 

 body-cavity, 401, 430 

 ,, brains, 40 



,, branchial organs, 151 



coelomic cavities in head region, 251, 266 

 ,, cranium, evolution of, 342 



egg of, 483 

 „ evolution of, 11 



excretory organs, 389, 391, 408 

 glands, ductless, 418 



,, internal secretion of, 215 

 heart, 175, 179, 180 



muscles, evidence of segmentation of eye, 248 

 oblique, 278 

 origin of somatic trunk, 406 

 ,, nervous system, central, 13 



nerves, segmental, 152 

 ,, notochord and gut, 434 



,, organs of, 10 



origin of, 9, 411, 433, 457 

 ,, segments, prosomatic, 257 



skeleton, commencement of bony, 120, 458 

 spinal cord and medulla oblongata, 44 

 spinal region, 385 



thyroid, connection between generative organs and, 215 

 „ tubes, meeting of four, 318, 440 



Vesicles, cerebral, formation of, 48, 458 

 Vitellophags, 471, 483 

 Volvox, 479 



Wolffian body, 390 



Xiphosuba, 24, 26, 249 



Yolk, 482 



THE END 



