xvi n LIST OF ILLUSTRATIONS. 



FIG. PAGE 



297. Lung of Chanuzleo vulgaris, showing air-sacs ( Wiedersheim) 605 



298. Snake's head (Nuhn) 608 



299. Heart and associated blood vessels of snake . . . 609 



300. Skull of grass snake (W. K. Parker) . . . . .611 



301. Lower surface of skull of a young crocodile . . . 613 



302. Cervical vertebra of crocodile ...... 614 



303. Crocodile's skull from dorsal surface . . . . .615 



304. Pectoral girdle of crocodile . . . . . .616 



305. Half of the pelvic girdle of a young crocodile . . . 617 



306. Origin of amnion and allantois (Balfour) .... 620 



307. Comparison of pelvic girdles of cassowary, Iguanodon^ an 



extinct Reptile, and crocodile ..... 623 



308. Position of organs in a bird (Selenka) . .... 627 



309. Diagrammatic section of young bird (Gadow) . . . 628 



310. A Falcon .......... 630 



311. Types of feathers ........ 632 



312. Entire skeleton of condor, showing the relative positions of 



the chief bones ........ 634 



313. Disarticulation of bird's skull (Gadow) .... 635 



314. Under surface of gull's skull ...... 636 



315. Wing of dove 638 



316. Side view of cassowary's pelvis ...... 639 



317. Bones of hind-limb of eagle ...... 640 



318. Brain of pigeon ......... 641 



319. Diagrammatic section of cloaca of male bird (Gadow) . . 642 



320. Heart and arterial system of pigeon ..... 644 



321. Heart and venous system of pigeon ..... 645 



322. Female urogenital organs of pigeon ..... 648 



323. Male urogenital organs of pigeon ..... 648 



324. Pectoral girdle and sternum of swan ..... 650 



325. Position of wings in pigeon at maximum elevation (Marey) . 651 



326. Wings coming down (Marey) ...... 652 



327. Wings completely depressed (Marey) ..... 652 



328. Stages in development of chick (Marshall) . . . . 658 



329. Diagrammatic section of egg (Allen Thomson) . . .659 



330. Diagrammatic section of embryo within egg (Kennel) . . 66 1 



331. Side view of rabbit's skull . ...... 676 



332. Dorsal view of rabbit's skull ...... 677 



333. Under surface of rabbit's skull ...... 678 



334. Rabbit's fore-leg 679 



335. Rabbit's hind-leg 680 



336. Dorsal view of rabbit's brain ...... 683 



337. Under surface of rabbit's brain (Krause) .... 683 



338. Diagram of caecum in rabbit ...... 685 



339. Duodenum of rabbit (From Krause, in part after Claude 



Bernard) ......... 686 



340. Circulatory system of the rabbit (in part after Parker and 



Krause) ......... 687 



341. Vertical section through rabbit's head, from a section, with 



help from Parker's "Zootomy " and Krause) . . 690 



