1825.] Mr, Gray on the Genera of Reptiles ^ 211 



Tesiudo, Lin, **Steraum 11 or 12 scaled, broad. E. cen- 

 trata, Merren, T. concentrica, Shaw, '^^^^'Toes 4-4 ; sternum 

 13 scaled. E. longicolis, Gray, Testudo, Shaw. 



The plastron of the last subgenus is covered with 13 scales ; 

 that is six pair marginal, and an unequal sided hexangular, one in 

 the middle of the anterior lobe. I have only observed an approxi- 

 mating distribution of the plates in a species of strenotherus ; 

 all the other Emyda that I have seen have had only the six pair 

 of marginal plates, the first pair sometimes soldered so as to 

 form only 1 1 plates. 



Beak horny ; sternum transversely sutured, Terraphenina. 



2. Terraphene, Merrem. Cistula, Say, Tortuis a boit, 

 Cuvier, ' 



Body convex ; sternum of 11 or 12 plates, moveable ; the two 

 central plates united to the carapace by ligament; the posterior 

 lobe broad fixed, the anterior one, of five or six plates, separated 

 by a transverse ligamentous hinge. 



T. clausa, Merren, Testudo, Gmelin. 



This genus forms the pass between the Emydae 9,nd the Tes- 

 tudinidtB, for it has the convex form and solid shell of the latter, 

 and the feet and general characters of the former. It is also 

 intermediate in point of habits, for it is often found in hot dry 

 places. 



Mr. Bell observes, that Testudo Europea is a species of this 

 genus ; if so the name of it should be changed, as that was cer- 

 tainly the Emys of the ancients. 



3. Sternotherus, Bell, MSS. Tortues a boit ^*Cuv, 

 Body depressed ; sternum of 11 or 12 plates; the central part 



of two plates united to the carapace by two long processes fixed ; 

 the anterior lobe moveable, separated by a transverse ligamen- 

 tous hinge ; the posterior lobe narrow, fixed. 



S. odorata, Gray, Testudo, Latr, S. pensylvanica, Testudo, 

 Gmelin, 



Obs, Cuvier describes the anterior and posterior lobes of the 

 sternum of these species to be moveable ; but the hinder was 

 fixed on the specimens which I have examined, which were all 

 dry. 



4. Kino stern CM, Spix, 



Body depressed ; sternum central part fixed ; anterior and 

 posterior lobes moveable ; throat bearded. 

 K. longicaudatum. 



^Beaksoft, Chelidina. 



5. Chelys, Dameril, Matamata, Merrem, 



Claws 5-4 ; body depressed ; lips soft ; nose produced. 



p2 



