438 



INDEX. 



Tutidanus, 283. 

 Twixt brain, 49. 

 Tylopoda, 396, 398. 

 Tylosurus, 257. 

 Tympanic bone, 357. 

 Tympanum, 73. 

 Typhline, 320. 

 Typhlogobius, 263. 

 Typhlonectes, 288. 

 Typhlops, 326. 

 Typotherium, 402. 

 Typothrax, 328. 

 Tyrannus, 351. 

 Tyrant bird, 351. 



Uintatherium, 400. 

 Ulna, 176. 

 Ulnar artery, 189. 

 Ulnare, 176. 

 Umbilicus, 288. 

 Umbra, 257. 

 Umbridae, 257. 

 Unciforme, 177. 

 Uncinate process, 146. 

 Ungulata, 391. 

 Ungulata Vera, 392. 

 Unguligrade, 361. 

 Unicorn fish, 266. 

 Unipolar nerve cells, 10. 

 Upeneus, 261. 

 Upupa, 348. 

 Ur, 400. 

 Uranidea, 259. 

 Uranoscopus, 261. 

 Ureter, 122. 

 Urethra, 124. 

 Uria, 349. 

 Urinator, 349. 

 Urochordia, i. 

 Urodela, 284. 

 Urogenital ducts, 126. 

 Urogenital organs, 116. 

 Urogenital sinus, 130. 

 Urohyal, 335. 

 Uropeltes, 326. 

 Urostyle, 142. 

 Urotrichus, 385. 

 Ursidae, 412. 

 Ursus, 412. 

 Uterine placenta, 374. 

 Uterus, 127. 



Uterus masculinus, 128. 

 Utriculus, 70. 



