434 



INDEX. 



Rattlesnake, 325. 



Rats, 390. 



Rectal gland, 36. 



Rectrices, 330. 



Rectum, 38. 



Rectus muscle of eye, 84, 



114. 

 Rectus muscles of trunk, 



US- 

 Reduction division, 208. 

 Regalecidas, 264. 

 Regalecus, 264. 

 Reindeer, 399. 

 Remiges, 330. 

 Remora, 264. 

 Renal artery, 191. 

 Renal portal system, 196. 

 Renal vein, 196. 

 Reproductive organs, 124. 

 Rennet, 35. 

 Respiratory tract, 76. 

 Rete, 130. 



Reticulate tarsus, 331. 

 Reticulum, 35. 

 Retractor bulbi, 84. 

 Rhachianectes, 410. 

 Rhachitomi, 283. 

 Rhachitomous, 136. 

 Rhabdopleura, 3. 

 Rhamphastos, 348. 

 Rhamphostoma, 328. 

 Rhea, 346, 

 Rheidas, 345. 

 Rhinencephalon, 52. 

 Rhinoceridae, 395. 

 Rhinoceros, 395. 

 Rhinolophidae, 387. 

 Rhinolophus, 387. 

 Rhinophis, 326. 

 Rhinotrema, 288. 

 Rhipidistia, 249. 

 Rhombodipterini, 249. 

 Rhombus, 263, 265. 

 Rhynchocephalia, 313. 

 Rhynchodus, 242. 

 Rhynchosuchus, 328. 

 Rhynchotus, 346. 

 Rhytina, 405. 

 Rhytinidae, 405. 

 Rhytiodus, 405. 

 Rib, 143. 

 Ribbon fish, 264. 

 Ribodon, 405. 

 Right whale, 410. 



