LIST OF ILLUSTRATIONS xv 



FIO. PACJK 



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 europrea, tarsus , . . . 329 



939. Alligator, carpus 329 



940. ,, pelvis 330 



941. Crocodile, tarsus 330 



942. Monitor, Emys, and Alligator, tongues 331 



943. Chameleon, lungs 332 



944. Varanus, heart 333 



945. Turtle, diagram of heart 334 



946. CrocodileJ^rt . . . . .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 



9*58. ,, mantelli, teeth 347 



959. Pterodactylus spectabilis 348 



960. Scaphognathus, skull 349 



961. Rhamphorhynchus 349 



Edestosaurus 350 



Columba livia, external form 352 



,, ,, feathers 353 



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 specimen! 360 



972. Diagram of Bird's skull . . 361 



973. Columba livia, hyoid apparatus . 362 



,, ,, columella auris 362 



,, ,, bones of left wing 363 



,, ,, manus of nestling 364 



,, ,, innominate of nestling 364 



,, ,, bones of hind -limb 365. 



,, ,, foot of embryo . . 366 



