TORTOISES. 21 



** Back tubercularly keeled, neck streaked. 



The Geographic Emys. Emys geographica, Lesueur, Jour. 

 Acad. N. S. Phil. i. 86, t. 5. E. Lesueurii, Gray, Syn. R. 31. 

 E. pseudographica, Lesueur, MSS. 



Shell ovate, convex, smooth, tuhercularly keeled in front and 

 slightly toothed "behind, olive-brown, with black-edged anastomo- 

 sing pale lines ; 1st and 5th vertebral plate broad, five-sided, rest 

 broad, six-sided ; sternum yellow ; shields blackish-edged, under 

 side of the marginal plates olive, with rather concentric, black- 

 edged, broad and narrow pale lines ; head and feet with numerous 

 yellow lines, and a yellow streak on each temple. 



a. Animal and shell. The head and throat with broad yellow 

 lines, a dark spot in the upper part of the hinder margin of the 

 two front costal shields. N. America. From Mr. Cuming's col- 

 lection. 



b. Animal and shell. The head and throat with narrow 

 yellow lines, a dark spot in the middle of the hinder edge of the 

 two front costal shields. N. America. From M. Parzudati's col- 

 lection. 



The Large-head Emys. Emys megacephala, Holbrook, N. 

 A. Herpet. i. 51, t. 3. 



Shell suboval, flattened, keeled, serrated and acute behind, 

 very dark brown, with obscure orange lines ; sternum oblong, 

 slightly nicked behind, dingy yellow ; head very large ; jaws 

 entire. 



Inhabits N. America. Cumberland river, Tennessee, Troost. 



Bennett's Emys. Emys Bennettii, Gray, Des. Cat. Rept. 

 (ined.) 13, n. 32. 



Shell oblong, rather convex, bluntly and subtubercularly 

 keeled, expanded and entire behind ; shields dark horn-colour, 

 concentrically grooved, with a broad blackish edge ; the vertebral 

 shields as broad as long, 1st squarish, convex, 2nd, 3rd and 4th 

 six-sided, 5th rounded in front, three-sided behind, nuchal plate 

 oblong ; beneath yellow, with the middle of the sternal plates, all 

 but the edge of the axillary and inguinal plates, and a very large 

 spot rather nearer the hinder edge of the marginal shields, black : 

 animal olive ; head and neck with black and yellow lines. 



Inhabits North America ? Mus. Zool. Soc. 



*** Shell keelless or only keeled when young, neck streaked, the three 

 front middle claws often elongated, straight. 



The Potter or Red-bellied Terrapen. Emvs serrata, 

 Say, J.A.N. Philad. iv. 204. Harlan, Amer. Erpet. 78. Gray, 

 Syn. 2\). E. serrata, var. Schlegel, F. Japon. 58. E. irrigata, 



