LIST OF ILLUSTRATIONS xv 



FIG. }-V.K 



932. Tropidonotus natrix, skull . 324 



933. Crotalus, skull . . 325 



934. Hatteria ,, . 326 



935. Emys europrea, skull . . 327 



936. Chelone midas . 327 



937. Crocodile, skull . 328 



938. Emys europsea, tarsus ... . 329 



939. Alligator, carpus . 329 



940. ,, pelvis 330 



941. Crocodile, tarsus . 330 



942. Monitor, Emys, and Alligator, tongues 331 



943. Chamaeleon, lungs . 332 



944. Varanus, heart . 333 



945. Turtle, diagram of heart 334 



946. Crocodile, heart . 334 



947. Alligator, brain . . 335 



948. Hatteria, pineal eye . 336 



949. Alligator, early development . 338 



950. Rattlesnake, poison apparatus 340 



951. Belodon, skull .... . 343 



952. Galesaurus planiceps, skull . . 344 



953. Plesiosaurus macrocephalus . 345 



954. ,, pectoral arch . 345 



955. ,, pelvic arch . 345 



956. Ichthyosaurus communis . .... . 346 



957. Iguanodon bernissartensis . 347 



958. ,, mantelli, teeth . . ... 347 



959. Pterodactylus spectabilis 348 



960. Scaphognathus, skull . 349 



961. Rhamphorhyiichus . 349 



962. Edestosaurus .... . 350 



963. Columba livia, external form . 352 



964. ,, ,, feathers .... 353 



965. Structure of feather .... 354 



966. Development of feather . . . 356 



967. Columba livia, pterylosis . . . . . 357 



968. ,, ,, bones of trunk 358 



969. ,, ,, cervical vertebra 359 



970. ,, ,, sacrum of nestling 359 



971. ,, ,, skull of young specimem .... . 360 



972. Diagram of Bird's skull . .361 



973. Columba livia, hyoid apparatus 362 



974. ,, ,, columella auris 362 



975. ,, ,, bones of left wing 363 



976. , , , , manus of nestling 364 



977. , , , , innominate of nestling 364 



978. ,, ,, bones of hind-limb 365 



979. , , , , foot of embryo 366 



