LIST OF ILLUSTRATIONS. XIX 



FIG. 



. PAGB 



299. The early development of the salmon . . t 559 



300. Development of eel after Smit .... 563 



301. Young skate from Beard . , . . .566 



302. Lateral view of dogfish (Scylliuni catulus} . . . 567 



303. Outline of Acanthodes sulcatus after Traquair . . 569 



304. Larva of Polypterus (after Budgett), I \ inch in length . 570 



305. Sturgeon (Adpenser stttrio) ..... 570 



306. The goldfish ( Cyprimts aiiratus] . . . . 572 



307. Lcpidosiren (after Graham Kerr), showing (Pc.f.) pectoral 



fin and the tufted pelvic fin (Pv.j.} of the mature male 574 



308. Skeleton of Ceratodus fin from Gegenbaur . -575 



309. Head region of Protopterus from W. N. Parker , . 576 



310. Larva of Protopterus after Budgett . . . 576 



311. Larva of Lepidosiren after Graham Kerr . . 577 



312. The edible frog (Rana esculenta) .... 580 



313. Vertebral column and pelvic girdle of bull-frog . . 582 



314. Skull of frog upper and lower surface after W. K. Parker 583 



315. Skeleton of frog. The half of the pectoral girdle, and fore- 



and hind -limb of the right side are not shown . . 5^5 



316. Pectoral girdle of Rana esculenta after Ecker . . 586 



317. Side view of frog's pelvis after Ecker . . . 586 



318. Brain of frog after Wiedersheim . . . 587 



319. Nervous system of frog after Ecker . . . 588 



320. Arterial system of frog ..... 592 



321. Venous system of frog ..... 593 



322. Urogenital system of male edible frog after Ecker . . 597 



323. Urogenital system of female frog after Ecker . . 597 



324. Division of frog's ovum after- Ecker . . . 599 



325. Section of frog embryo after Ziegler's model and Marshall 600 



326. Dissection of tadpole after Milnes Marshall and Bles . 601 



327. Life history of a frog after Brehm .... 605 



328. Csecilian (Ichthyophis) with eggs after Sarasin , . 607 



329. External appearance of tortoise . . . .613 



330. Skull of turtle . . . . . .613 



331. Carapace of tortoise ..... 614 



332. Pectoral girdle of a Chelonian . . . .615 



333. Internal view of bones of the plastron of the Greek tortoise 616 



334. Scales on ventral surface of plastron of Greek tortoise . 617 



335. Internal view of skeleton of tortoise . . , 618 



336. Dissection of chelonian heart rafter Huxley . . 618 



337. Heart and associated vessels of tortoise after Nuhn . 619 



338. Hyoid apparatus of a chelonian .... 620 



339. Lateral view of brain of Hatteria punctata after Osawa . 621 



340. Hatteria or Sphenodon after Hayek . . .621 



341. Side view of skull of Lacerta after W. K. Parker . . 624 



342. Heart and associated vessels of a lizard after Nuhn . 626 



343. Lung of Chamaleo vulgaris^ showing air-sacs after Wieders- 



heim ....... 627 



344. Anterior view of python's vertebra .... 630 



345. Posterior view of python's vertebra . 630 



