57 



agrees in mauy points with the northern fauna of the Old World, and 

 has been united with it by some authors ; but its peculiar types, and 

 those which it shares with South America, are too numerous for such an 

 arrangement. Its relations are exhibited in the following table : 





Differs from Palaearctic in — 



Agrees with Palaearctic 







in — 



Peculiar forms. 



Neotropical forme. 



Mammalia in general 





Bassarididae. 







Procyonidae. 





Antilocapra . 



Megadermatidae. 



Dicotyles. 



Didelphys. 





Mephitis 







Birds except 





Cathartidae. 







Tanagridae. 







Icteridae. 







Clamatores in general. 







Trochilidae. 





Meleagridae . 



Odontophoriuae. 







Alligators. 







Amivid and Gerrhonotid lizards. 







Iguanid lizards. 



Emyd tortoises 



Chelydra 



Cinosternidae. 







Solenoglyph and Elapid venomous 







snakes. 



Raniform frogs 



Scaphiopodidae .... 



Arcifera. 





Plethodontidae. 







Amblystomidae. 





Diemyctylus. 







Megalobatrachus 



Trachystomata. 



Necturns. 



Amphiumidae. 





Percid fishes 



Aphredoderidae 



Siluridae. 



Cottidae. 





Haplomi 



Hypsaeidae. 





Accipenseridae. 





Spatulariidae. 







Cyprinidae 



Plagopterinae. 

 Catostomidae. 





Gasterosteidae. 







Amiidae. 







Lepidosteidae. 





Petromyzon. 







The special peculiarities of the Nearctic region are then chiefly seen 

 in the Fishes and Batrachia. In Birds and Mammals, its prominent 

 divergences from the northern regions of the Old World are seen in the 

 numerous representatives of forms which are characteristically South 



