INDEX 



337 



Vertebrae, Chondrostei, 28 

 cyclospondylous, 30 

 Cyclostome, 27 

 development, 19 

 Dipnoi, 35 

 Elasmobranch, 29 

 embolomerous, 32, 37 

 heterocoele, 47 

 lepospondylous, 37 

 Mammals, 48 

 occipital, 62, 82 

 opisthocoelous, 22 

 phyllospondylous, 38 

 Pisces, 27 

 procoelous, 22 

 pseudosacral, 25 

 Reptiles, 42 

 rhachitomous, 32, 37 

 sacral, 25 

 Teleost, ;i$ 

 Tetrapoda, ^6 



Vertebral centrum, 18 

 column, 18, 25 

 rib, SI 

 theory of skull, 58 



Vertebrarterial canal, 24 



Msceral arches, 58, 64 



skeleton, 18, 58, 64 

 Viscerocranium, 58 

 Vitrodentine, 10 

 Vomer, 77 



Vomero-nasal organ, 191 

 Vomero-palatine, 127 



Weberian apparatus, 109 

 Wishbone, 256 

 Wormian bones, 8, 193 



Xantusia, pectoral girdle, 250 

 Xenacanthus, vertebr£e, 29 

 Xenarthra, skull, 207 

 Xiphiplastron, 15 

 Xiphisternum, 51 



Ypsiloid cartilage, 262 



Zeugopodium, 275 

 Zygantrum, 43 

 Z3^gapophyses, 18 

 Zygomatic arch, 195 



bone, 73 



process, 196 

 Zygosphene, 43 



