VERTEBRATA 



PALEOZOIC MESOZOIC KAINOZOIC MODERN 



INVERTEBRATA. 



PALEOZOIC MESOZOIC KAINOZOIC MODERN 



DISTRIBUTION OF ANIMALS IN TIME. (p. 420.) 

 Vertebrata. i, Ganoid Fishes; 2, Teliort Fishes; 3, Batrachians; 4, 



Reptiles ; 5, Birds ; 6, Mammals. 



Invertebrata. I , Trilobites, etc. ; 2, Worms ; 3, Bivalve and Univalve 



Shellfishes ; 4, Nautiloid Shellfishes ; 5, Cuttlefishes. 



It will be noticed that Nos. 2 and 5 in the first table, and 3 and 5 in the 



second, follow a different order of curve from the others, indicating their 



exceptional culmination in modern times. 



