XVI 



List of Illustrations. 



Pia. 



318. Skeleton of a TJrodele 



319. Visceral arches of a Salamander . 



320. Skull of a Prog 



321. Sternum and shoulder-girdle of a Salamander 



322. Sternum and shoulder-girdle of a Frog 



323. Pelvis and last vertebrae of a Prog 



324. Pelvis of Prog . ... 



325. Transverse section of head of Prog 



326. Head of a TJrodelan larva .... 



327. Tadpoles. ... 



328. Arterial arches of the Urodela 



329. LarvEe of the large Triton 



330. Skull of a Stegocephalon 



331. Embryo of Mpicrium glutinoswm 



332. Sections through scales of Reptiles 



333. Transverse section of the atlas of a Vertebrate 



334. Diagram of axis 



335. SkuU of a Lizard . 



336. Hyoid of a Lizard . 



337. SkuU of a Boa constrictor 



338. Skull of a Crotalus . 



339. Sternum and shotdder girdle of Lacerta 



340. Carpus of a Turtle . 



341. Carpus of a Lizard . 



342. Pelvis of a Lizard 



343. Brain of a Lizard 



344. Vertical section of eye of Lizard and of Snake 



345. Diagrams of various lungs ..... 



346. Head and neck of an Alligator 



347. Diagram of the heart and arterial arches of a Crocodile 



348. Poison tooth of a Crotalus 



349. Poison gland and poison fang of a Snake 



350. Tail end of a Crotalus 



351. SkuU of a Gavial . 



352. An Ichthyosaurian 



353. A Plesiosaurian 



354. A Pterodactyle 



355. Iguanodon 



356. Pore and hind limbs of a Dinosaurian . 



357. Portion of a feather 



358. Diagrams of feathers with aftershafts . 



359. Down and feather of young Bird . 



360. Tails of various Birds 



361. Skeleton of a Eaven 



362. SkuU of a Eaven ... 



363. Diagrams iUustrating movement of beak in Birds 



364. Skull of young Chick . . . . 



365. Hyoid of the Powl 



366. Sternum and shoulder girdle of the Eaven . 



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