1873.] 



DR. J. E. GRAY ON THE TRIONVCHID.E. 



59 



Trionyx georgicus, Geoffr. Ann. Mus. iv. p. 7 (from Pennant) 

 Trionyx ferox, Leconte, Ann. Lye. N. York, 1830, iii. p. 393* 

 La Molle, Lace'pede, Qu. Ov. et Serp. i. p. 137, t. 7 (from Pennant). 

 Gymnopus spmiferus (part), Dume'ril et Bibr. Erpe't. Gen. ii. 



Aspidonectes ferox, Wagl. Syst. t. 2. figs. 34 & 35. 

 Platypehis ferox, Fitz. Rept. p. 30 ; Gray, P. Z. S. 1869, p. 214 ; 

 Suppl. Cat. Sh. Rept. p. 107 ; Agassiz, Contrib. t. 6, fig. 3 (young)' 

 Trionyx frenatus, a, Gray, Cat. Sh. Rept. p. 67 (youn-) 

 Gymnopus javanicus, Bibr. MSS. Mus. Zool. Soe. 



Fig. 9. 



Platypeltis ferox. 



The skull of a young specimen received from the Zoological So- 

 ciety has the head depressed ; nose tapering in front ; nose-hole 

 large, wider behind, with the upper edge prominent in the middle • 

 distance between the nose-hole and the orbit \ the diameter of the 

 latter; orbits large, close together ; alveolar surface narrow in front 



