xviii LIST OF ILLUSTRATIONS 



FI(J. PAGE 



276. The excretory and reproductive organs of (a) a male, and 



(b) a female Frog 556 



277. Tadpole of Rana esculenta ....... 557 



278. Two stages in the development of the front part of the 



vertebral column of an Amniote (the Lizard) . . 564 



279. Section through the scale of a Lizard . . . . 568 



280. Ventral view of the shoulder-girdle and sternum of a Lizard, 



Loemanctus longipes ........ 570 



281. Lateral view and longitudinal section of the skull of a Lizard, 



Varanus varius . . . . . . . . . 572 



282. Diagrams of the cranial roof in a Stegocephalan, various 



types of reptile and a bird, showing modifications in the 

 postero-lateral region ....... 



283. Lateral view of the shoulder-girdle of a Lizard, Varanus . 



284. View of the interior of the mouth of Varanus indicus 



285. Diagram of the arterial arches of Chamaeleo . . . 



286. Diagram of the venous system in Anura and Reptilia 



287. Excretory and reproductive organs of a male Lizard 



288. Lateral, dorsal, ventral and posterior views of the skull of 



Sphenodon punctatus ... ... 



289. A limbless Lizard, Anguis fragilis, the Blind-worm . 



290. Dorsal and ventral views of the skull of the Common Snake, 



Tropidonotus natrix 



291. Diagram of the arterial arches of a Snake .... 



292. The Texas Rattlesnake, Crotalus atrox .... 



293. (1) Dorsal and ventral views of the carapace of a Loggerhead 



Turtle, Thalassochelys caretta ; (2) The plastron of a Green 

 Turtle, Chelone mydas ....... 



294. Ventral view of the skeleton of the Green Turtle, Chelone 



mydas .......... 



295. Longitudinal vertical section through the cranium of the 



Green Turtle, Chelone mydas ...... 



296. Diagram of the arterial arches of a Turtle viewed from 



ventral surface 



297. Palatal aspects of the cranium and of the mandible of an 



Alligator, Caiman latirostris ...... 



298. The first four cervical vertebrae of a Crocodile, Crocodilus 



vulgaris .......... 



299. Sternum and associated membrane bones of a Crocodile, 



Crocodilus palustris ........ 



300. (a) Left half of the shoulder-girdle and (6) the pelvis and 



sacrum of an Alligator, Caiman latirostris . . . 



301. Diagram of the arterial arches of a Crocodile 



302. Section through the skin of a Bird showing a developing 



feather 



