40G 



GEOGRAPHICAL ZOOLOGY. 



[PART IV. 



Family 55.— CKOCODILID^E. (1 Genus, 12 Species.) 



General Distribution. 



Neotropical 

 Sub-regions. 



n earctic 

 Sub-regions. 



Pal.«arctic 

 sub-hegions. 



Ethiopian 

 Sub-regions. 



Oriental 

 Sub-kegions. 



Australian 

 Sub-regions. 



— 2.3.4 



1.2.3.4 1.2.3.4 



The true Crocodiles, which have the canines in notches, and 

 the large front teeth in pits, in the upper jaw, are widely 

 distributed over the tropical regions of the globe, inhabiting all 

 the rivers of Africa, the shores and estuaries of India, Siani, 

 and eastward to North Australia. Other forms inhabit Cuba, 

 Yucatan, and Guatemala, to Ecuador and the Orinooko. Four 

 species are Asiatic, one exclusively Australian, three African, 

 and four American. These have been placed in distinct 

 groups, but Dr. Gunther considers them all to form one 

 genus, Crocodilus. 



Family 56.— ALLIGATORID.E. (1 Genus, 10 Species.) 



The Alligators, which are distinguished by having both the 

 large front teeth and the canines fitting into pits of the 

 upper jaw, are confined to the Neotropical, and the southern 

 part of the Nearctic regions, from the lower Mississippi and 

 Texas through all Tropical America, but they appear to be 

 absent from the Antilles. They are all placed by Dr. Gunther 

 in the single genus, Alligator. 



General Remarks on the Distribution of Crocodilia. 



These animals, being few in number and wholly confined 

 to the tropical and sub-tropical regions, are of comparatively 



