G. ciriiTSEJirs. — 7. ocabta. 85 



Ujiited States, east of Ohio, from New York and New Jersey to 

 North Caroliua. 



a. IlfTi'., spir. Waslihigton, D.C. Smithsonian Instit. 



b-d. Yg., spir. N. America. Lord Am])tliill [P.]. 



«> /> fh d , ? , & 3'g., N. America. 



•St lid. 



/(, i, /,-. (5 2) skel. N. America. 



/. Shell. N. America. (Type of Emijs rivuhdd.) 



12. Chrysemys mohiliensis. 



Emvs niobilensis, llulhr. N. Am. llcrp. i. p. 71 , pi. ix. (1S42) ; Gratj, 

 Cut. Tort. p. 25 (1844) ; A. Dum. Cut. Mtth. p. 11 (1851). 



Ptychemys mobilieusis, Agassis, Contr. N. II. U. H. i. p. 4^-3, pi. iii. 

 figs. 14-1(5 (18.57). 



Clemmys mobik'nsis, Strauch, Chelon. Stud. p. 32 (1862). 



Pseiulemys mobiliensis, Gray, Ann. Sf May. N. II. (u) xii. p. 182 

 (1803). 



Distingriiished from C. concinjia and C. ruhrlventris, to which it is 

 closely allied, by the greater elevation of the shell anteriorly ; from 

 the former by having the beak notched and bicuspid as in the latter, 

 from vfhich it differs by having the upper jaw but very finely 

 serrated. 



Borders of the Gulf of Mexico, from Florida to North Mexico. 



7. OCADIA. 



Emvs, part., Gray, Cat. Tort. p. 14 (1844), and Sh. Eept. i. p. It) 



(1855) ; Giinth. licpt. Brit. Lid. p. 21 (1864). 

 Clemmys, part., Strauc/i, C/iclon. Stifd. p. 28(1862). 

 Ocadia,' Gray, St(2ypl. Cat. Sh. Kept. i. p. 36 (1870). 



Neural plates hexagonal, short-sided in front. Plastron exten- 

 sively united to the carapace by suture, with strong axillary and 

 inguinal buttresses, extending to halfway between the marginal and 

 neural plates, the latter anchyloscd between the fifth and sixth 

 costal plates ; entoplastron intersected by the humero-pectoral suture. 

 Skull with a bony temporal arch ; alveolar surfaces broad, of upper 

 jaw with a median ridge ; choanal between the eyes. Upper surface 

 of head covered with undivided skin. Digits entirely webbed. 

 Tail moderate. 



China. 



1. Ocadia sinensis. 



Emys sinensis, Gray, Froc. Zool. Soc. 18.34, p. 53, a7id Cat. Tort. 



p. 17 (1844), andSh. Eept. i. p. 20, pi. vii. (1855) ; Giinth. Kept. 



Brit. Ind. p. 27 (1864). 



bennettii, Gray, Cat. Tort. p. 21, and Sh. Bept. i. p. 22, pi. x. 



Clen}mys sinensis, Strauch, Chelon. Stud. p. 32 (1862). 



bennettii, Strauch, I. c, and Verth. Schildhr. p. 72J1865). 



Ocadia sinensis, Gray, Snppl. Cat. Sh. Bept. i. p. 35 (1870). 



h2 



