ORDER OPHIDIA. 



yellow ring placed across the sutures of the vertebral plates ; 

 beneath pale brown, varied with darker brown. ( ?) 



III. Sternum united to the hack shell hy a horny suture ; 

 before rounded, behind rounded, or slightly nicked, 

 divided by one or two cross sutures ; sternal plates, eleven 

 gular pair united. Kinosternon. Spice. 



Three-keeled KinGsternon. E. {^Kinosternon) Scorpoides. 

 Test. Scorpoides, Lacep. Test. Tricari7iata, Daud. Ki- 

 nosternon Shavianum, Bell. Kin. Longicaudatum, Spix, 

 t. 12 ? Shaw Zool. t. 15. Jun. Test. Retzii, Daud. 

 Shaw, t. 11. 



Shell oblong, olive polished, rather compressed three- 

 keeled, keels continued, dorsal shields long, hexangular, sub- 

 imbricate ; sternum as broad as the opening of the shell. 

 South America. 



Three Ridged Kinosternon. E. (Kinosternon) Triporcafa, 

 Gray. Terrapena Triporcata, Wiegmann, Mus. Berl. 



Shell, oblong, olive, with three very high compressed ridges ; 

 sternum cross shaped, very narrow; the largest species of 

 the genus. 



Pennsylvanian Kinosternon. E. (Kinosternon) Penn- 

 sylvanica. Test. Pennsylvanica, Bosc. Test. Subrufa, 

 Lacep. Edw. t. 287- Var. Test. Glutinata, Daud. 

 Test. Boscii, Merrem. 



Shell oval, brown ; dorsal shields, flattened ; sternum, 



rather narrower than the opening of the back shell ; behind 



nicked. North America. 



Mushy Kinosternon, E. {Kinosternon) Odoratum. Test. 

 Odorata, Bosc. Cistuda Odorata, Say. Sternotheros 

 Odoratue, Bell. 



Shell ovate, keeled ; sides declivate ; sternum very narrow ; 



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