262 TRIONYCHID &. 
adult, with a callosity; each epiplastron likewise with a callosity, 
which is, however, very minute. Brown above, whitish inferiorly ; 
head without markings ; back blotched with darker brown. 
The length of the dorsal disk does not exceed 25 centim. 
Mississippi, Ohio, and Saint Lawrence. 
a. Her., stffd., skull separate. ——-?* (Type of Callinia microcephala.) 
2. PELOCHELYS. 
Chitra, part., Gray, Cat, Sh. Rept. i. p. 70 (1855); Giinth, Rept. 
Brit. Ind. p. 50 (1864). 
Pelochelys, Gray, Proc. Zool. Soc. 1864, p. 89, and Suppl. Cat. Sh. 
Rept. i. p. 90 (1870), and Proc. Zool. Soc. 1878, p. 40. 
Outer extremities of the nuchal plate overlying the second dorsal 
rib; neural plates well developed. Limbs completely exposed. 
Hyoplastron distinct from hypoplastron ; not more than five plastral 
Fig. 69. 
Skull_of Lelochelys cantoris, .. (From Gray, P, ZS 1364.) 
callosities. Bony choanse between the orbits; jaws weak; post- 
orbital arch as broad as the diameter of the orbit; pterygoids 
posterior border free, without ascending process. 
East Indies. 
* The specimen, stated to have been obtained by Mr. Wallace at Sarawak, 
was purchased at Stevens’s sales. 
