210 Mr. Gray on the Genera of JHeptile^* [Sept. 



5. 'Eryx, Baud, Erix, Cuv. 



Head distinct from the trunk ; body covered above with hex- 

 agonal scales, below with small narrow subquadrate shields ; tail 

 iShort, blunt, with one row of scales beneath. 



E. turicus, DauiL 



6. Clotiionia, Daud, 



Head distinct from the trunk ; body covered above with hex- 

 agonal scales, below with small narrow subquadrangular shields ; 

 tail short, blunt, with simple and double shields, 



C. anguiformis, Daud, 



Order Y. Chelo^ ii, Latreille* Cheloniens, Brogniart, Tes- 

 tudinata, OppelL 



Body short, inclosed between two horizontal shields, with the 

 head, neck, tail, and four legs, passing out between ; mouth 

 toothless, often covered with a horny bill ; tongue short. 



The upper shield, or Carapace, is formed by the ribs (eight 

 pair) enlarged and united together, and to the annular part of the 

 dorsal vertebra, by toothed sutures, so as to be immovable ; 

 the lower shield, or plastron, is formed of the pieces which 

 represent the chest bone (usually nine), and a circle of bones 

 analogous to the sternal cartilages of quadrupeds. The vertebra 

 of the neck and tail alone are movable. The two bony envelopes 

 are immediately covered with the skin or scales, and surround 

 the muscles of the extremities ^ 



§ 1. Feet and head retractile into the carapace; carapace solid, 

 covered with hornt/ scales. Cryptopodi, 



Fam,l, TESTUDlNlDiE. 



Body covered with horny shields ; carapace convex solid ; 

 sternum, attached by the greater part of its sides to the carapace; 

 legs horny ; feet club shaped ; toes indistinct, bluntly clawed ; 

 dorsal plates, 13 ; sternal, 12, Terrestrial. 



Testudo, Dumaril. Chersini, Merrem, 

 T. grseca, Lin, 



FamAL Emydidm, BellMSS. 



Body covered with horny shields ; carapace depressed ; ster- 

 num attached to the carapace by a small surface ; lips horny or 

 soft ; feet digitate ; fingers distmct ; claws sharp ; fluviatile or 

 lacustral. 



*Beak horny; sternum entire, Emydina. 

 1. Emys, Brogn. 



Toes 5-4, or 4-4 ; depressed elongated, palmated ; sternum 

 immovable. 



*Sternum very narrow. Rapara, R. serpentina, Gray, 



