68 EMYS FLORIDANA. 



I. They differ so much in colour and markings, as may be seen in the accom- 

 panying plates, that this of itself would be almost sufficient to distinguish them 

 in the living animals. 



II. They differ greatly in size. 



III. In geographical distribution. 



IV. In the various characters of the head, jaws, and shell, as heretofore 

 observed. 



The Eniys serrata has the jaws without serrte, the upper slightly emarginate in 

 front; the posterior margin of the shell deeply serrate; inhabits the Carolinas. 



The Emys rubriventris approaches nearest to it, but has the upper jaw so 

 deeply emarginate in front as to present the appearance of two teeth; and the 

 lower deeply serrated, and toothed in front; inhabits from Western Jersey to 

 Virginia; these two animals are nearly of the same size. 



The Emys reticulata is widely different; it has the upper jaw emarginate in 

 front; lower one hooked; shell perfectly entire; inhabits the Carolinas. 



The Emys floridana comes nearest the Emys reticulata, in its characters, but 

 is still perfectly distinct; the upper and lower jaws are both entire, without hook 

 or serrae; shell entire. This animal is six or eight times the size of the Emys 

 reticulata; inhabits East Florida. 



The Emys scripta, if a North American tortoise, is the young of the Emys 

 serrata. 



The Emys decussata (Bell and Gray*) has not been found in the United States, 



* Gray, Synop. Rept., p. 2S, spec. xxii. 



