though in two groups its surface is leather-like 

 (Dermochelidae and Trionychidae) . Some of the 

 marine turtles attain a weight of over a ton. The 

 species which occur off our coast belong to the 

 following genera: Chelonia, EretmcckehjSy of the 

 Cheloniidae, and Dermochelys of the Dermcchely- 

 dae. Some fresh water turtles {Chelydra and 



Macrochelys) may attain a weight of over 50 lbs. 

 but the majority are of moderate size, and many 

 are small. Members of the genus Testudo, which 

 contains the well-known Galapagos Island tortoi- 

 ses (14 species recognized) , also reach a huge size. 

 The shell of one of these gigantic turtles is in the 

 possession of the Museum and may be seen by in- 

 terested visitors. The osteology is well illustrated 

 by the fine skeleton of the Green Turtle, Chelonia 

 mydaSy which is exhibited in the second floor hall. 

 KINOSTERNIDAE (Family) 

 Sternotherus (Genus) 

 76. Sternotherus carinatus (Gray) 

 KEELED STINK-POT. 

 An aquatic, carnivorous species inhabiting the 

 Western United States. 



77. Sternotherus odoratus (Latreille). 

 STINK-POT. 

 Similar in habits to preceding but found in 

 the Eastern U. S. The plastron bones shown illus- 

 trate the general osteology of that structure. 

 CHELYDRIDAE (Family). Macrochelys (Genus) 

 78. Macrochelys temmincki (Holbrook). 

 ALLIGATOR SNAPPER. 



