LIST OF ILLUSTRATIONS. 



PLATE 



PAGE 



XX. Amphioxus, . . • 3^8 



XXI. Skeleton, . . -376 



XXII. Nervous System, . 384 



XXIII. Circulatory System, . . 394 



XXIV. Urinogenital System, . . 400 



XXV. Cyclostomata, . . 408 



XXVI. Elasmobranchs, . . 424 



XXVII. Teleosteans, . . . . 436 



XXVIII. The Frog, . . . -448 



XXIX. Reptiles, . . . 488 



XXX. Birds, .... . . 504 



XXXI. Development of Mammals, .... S44 



XXXII. Mammalian Structures, . 552 



