240 Trans. Acad. Sci. of St. Louis. 



Habitat. — The Cumberland Turtle is found inhabiting 

 the territory from South Carolina to Mexico and north 

 along the tributaries of the Mississippi to the Yellowstone. 

 Missouri localities: — St. Louis, Jefferson, Butler, Stone, 

 Pemiscot, Newton, Saline, Pettis, and St. Charles Coun- 

 ties. Osage River (L. Agassiz). Illinois: — St. Clair and 

 Madison Counties. 



Habits. — This species is rather common in the neighbor- 

 hood of St. Louis on both sides of the Mississippi. It is 

 truly aquatic. I had some in captivity which became very 

 tame and fed out of my hand. 



94. Pseudemys troostii Holbrook. Troost's Turtle. 



Emys troostii, Chrysemys troostii, Trachemys troostii. 



Description. — Shell moderately convex, the slope gradual in front and 

 expanded above the insertion of the posterior legs, slightly depressed 

 inwardly. Third, fourth and fifth dorsal plates with an obscure, round- 

 ed ridge. Costal plates and the first and fifth (sometimes all) dorsals 

 longitudinally plicated. Nuchal narrow, long; the two adjacent mar- 

 ginals with the outer edges projecting. Posterior four marginals of 

 each side without outer angles, each with a marginal notch. Plastron 

 a little rounded in front, nearly truncate. Outer angles of the gulars 

 projecting considerably, the anterior edge roughened. Plastron broadly 

 emarginate behind. Head rather large, jaws strong, the upper with a 

 median notch, the lower with a corresponding hook. Tympanum well 

 marked. Feet strong, the posterior pair much expanded and strongly 

 webbed. Claws on front feet very long and slightly curved. Those 

 on the hind feet only about half the length of the anterior ones. 



Color. — Carapace greenish olive mottled and blotched with black. 

 The black confined mostly to the margins. Marginals beneath with 

 black oblong spots. Plastron pale yellow and black, the latter extend- 

 ing along the median suture as a w r ide, black stripe. The black stripes 

 on the transverse sutures are not as wide. Head dusky, obscurely and 

 finely mottled above and on the sides, below narrowly striped with 

 greenish. Jaws horn-color with vertical dashes of black on the upper, 

 and longitudinal ones on the lower. Feet and tail dusky yellow with 

 indefinite markings. 



Size. — Length of carapace 224 mm.; width of same 163 mm.; depth 

 '88 mm. Plastron 186 mm. long. 



Habitat. — Mississippi River and its tributaries from 

 the Gulf to northern Missouri. Missouri localities : — St. 



