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Show 60 DR. J. E. GRAY ON THE TRIONYCHlDcE. [Jan. 7, gradually wider behind ; central groove wide, rather deep, as wide as the front edge of the large internal nostrils. Lower jaw rather weak ; alveolar surface with a sharp edge, shelving inwardly; front part widest, concave; sides rather narrower, with a concave upper edge, gradually becoming narrower behind to the condyle. Length of the skull to condyle 1^ inch ; diameter f inch. This specimen was named Gymnopus javanicus by Bibron, and was described by m e as Trionyx frenatus in the Cat. Sh. Rept. p. 67, where I thought it was the same as a Tortoise I had received from Mr. Wallace, from Singapore : but the examination of the skulls has shown that the former is the young of the North-American Platypeltis ferox ; and the latter proves to be merely a specimen of Dogania subplana approaching maturity, which I had named Sarbieria frenata, an Asiatic species-showing the necessity of examining the jaws and skulls of these animals. 9. CALLINIA. Gallinia, Gray, P. Z. S. 186y, p. 221 ; Suppl. Cat. Sh. Rept. p. 108. Head elongate, rather thin, produced in front; nose-hole large, nasal bones projecting into its upper surface, acute; orbits large; palate with a wide shallow central depression, as wide as the large internal nostrils, and continued along its sides. Lower jaw weak, thin ; alveolar margin concave, much wider in front, narrower on the sides, especially behind. * The skull rather rounded in front; nose-hole as broad as long ; lower jaw rounded in front. 1. C A L L I N I A SPINIFERA. (Fig. 10, p. 61.) Trionyx spiniferus, Lesueur, M e m . Mus. xv. p. 258, t. 15. Aspidonectes spinifera, Agassiz, Contrib. p. 403, t. 6. figs. 1 & 2. Gymnopus spiniferus (part), D u m . et Bibr. Erpet. Gen. ii. p. 477, t. 22. fig. 1. Callinia spinifera, Gray, P. Z. S. 1869, p. 220 ; Suppl. Cat. Sh. Rept. p. 109. Trionyx ferox (part), Gray, Cat. Sh. Rept. p. 63. Trionyx ferox, e, Holbrook, Herpet. N . Amer. ii. 1.1. Trionyx argus, Gray, Cat. Sh. Rept. p. 68. Tyrse argus, Gray, Knowlesley Menag. t. Young.-Back with dark rings. Trionyx ocellatus, Lesueur ; Wied, Voy. Amer. Sept. iii. p. 244. Trionyx annulatus, Wied, Voy. Amer. Sept. iii. p. 242. Hab. North America. Skull elongate, produced in front, roundedattheend; nose-hole large, as broad as long, with the nasal bones projecting into the upper surface, acute; orbits very large; palate with a wide, rather shallow, central depression, as wide as the front of the large nostrils, and continued round the sides of the nostrils, and rather wider than they behind. Lower jaw rather weak, regularly tapering in front, where it is rounded |
