50 REPTILES. 



Phil. Trans, lxi. 266, t. 10, /. 5. Schneid. S. 330. Schoepf. t. 19. 

 Shaw, Zool. iii. 64, t. 17, /. 1. T. Bartramii, Daud. R. ii. 74. 

 LeConte. Chelys B. Geoff. Ann. Mus. xiv. 18. La Molle, Lacep. 

 Q. O. i. 137. t. 7. Tri. Georgicus, Geoff. Ann. Mus. xiv. 7. T. 

 spiniferus, Lesueur, Mem. Mus. xv. 258, t. 15. Dum. et Bib. E. 

 G. ii. 477, t. 22, /. 1. T. carinatus, Geoff. Ann. Mus. xiv. 14, t. 

 4. Wagler. , Syst. t. 2, /. 34, 35. Merrem, T. 21, (young). T. 

 Brongniartii, Schweig. Prod. i. 288. Fresh-water Turtle, Garden. 

 Fierce Turtle, Shaw. 



Thorax very depressed, with a series of spinous tubercles on 

 the front edge of the back. 



«. Adult, stuffed. N. America. Presented hy the Royal Society. 

 The specimen described and figured by Pennant, (re-stuffed). 



The Unarmed Trionvx. Trionyx muticus, Lesueur, Mem. 

 Mus. xv. 257, t. 7. Gray, Syn. R. 46. Dum. et Bib. E. G. ii. 482. 



Thorax much depressed, without any spinous tubercles on the 

 front edge. 



Inhab. N. America. Mus. Paris. 



Fitzinger has divided this family into the genera Trionyx 

 (granosus), Aspidonectes (Javanicus), Platypeltis {Brongniartii and 

 ferox), Pelodiscus (Sinensis and labiatus), Amyda (subplanus and 

 muticus), according to the union and separation of the cervical 

 bones and the ribs, and the rugoseness and partial smoothness of 

 the surface of the dorsal plates : but these characters alter with 

 the age of the animals, and they separate nearly allied species, 

 and those coming from the same countries. 



