CLASS REPTILIA. 



' B. Shields Imbricate. 

 4. Imbricated Turtle. Chehnia Imbricata., Schw. Testudo, 

 Schoepf. t. 18, a. 



Shell elliptically keeled ; shields yellow, spotted and rayed. 

 In the young, the ends of the shields are obliquely truncated, 

 and scarcely imbricate, Caretta Nasicoriiis^ Merrem. Schoepf. 

 t. 17> f« 1- Indian and Atlantic Ocean, 



Ord. 3. Emydosauri. 



Vertebrae of the back and the ribs free, mobile ; the mouth 

 toothed ; the feet digitate, webbed ; above and beneath co- 

 vered with imbeded squarish plates, with small scales on the 

 sides. 



Gen. 1. Crocodilus. 



Toes 4, 5, claws 3, 3 ; tail compressed, above keeled, ser- 

 rated ; teeth couical in a single series ; tongue fleshy. 



1. The head depressed ; the canine teeth of the lower jaw 



received in a pit in the upper jaw. Alligator. 



* Feet digitate. South America. 



Spectacled Alligator. Croc. (Alligator ) Sclerops, Schw. 



Seba, 1, t. 104, f. 10, Spix. Braz. 



With a cross rib between the orbits ; nape with a band of 

 shields. South America and Frazils. The frontal cross 

 rib varies in shape. 



Eye-browed Alligator. Croc. {Alligator) Palpebrosus, Cuv. 



Eyelids bony ; nape with a band of shields, each bearing a 

 crest. Var. the nuchal shields are sometimes irregular. Croc. 

 Trigonatus, Sehsi,\,t. i08,{. 3. Guicna. 



+ Feet, subpalmated. North America. 



Pike-muzzled Alligator. Cayman Croj. (Alligator) Lucius, 



Cuv. Croc. Cuvierii Leach Zool. Misc. t. 



Head depressed, parabolic, nuchal shields 4. North America. 



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