PELOCHELYS. 11 



V^ 



pair of costals, plastral callosities hardly developed, and mandibular 

 symphysis with a median ridge. Lower parts white. 



Length of disk 500 millim. 



Burma, Malay Peninsula, Sumatra, Borneo, Java. 



Eecorded from Penaiig by Anderson. 



7. Trionyx cartilagineus. 



Testudo cartilagima, Boddaert, Epistola ad W. Roell, 1770. 

 Gyimwpus cartilaginea, Cantor, Journ. Asiat. Soc. Bengal, xvi, p. 015 



(1847). 

 Triojuj.r ornatus, Gray, P. Z. S. 1861, p. 41, pi. v; Giinth. Kept. 



Brit. Ind. p. 48, pi. Vi, fig-. B (1864). 

 Trionyx carf/ilaymeus, Bouleno'. Cat. Chelon. p. 2.53 (1889) ; id. Faiin. 



Brit. Ind., Kept. P- 15 (1890) ; S. Flower, P. Z. S. 1899, p. 620. 



Disk not or but little longer thau broad; last costal plate 

 forming a suture with its fellow ; a single neural plate between 

 the first pair of costals. Epiplastra in contact, or narrowly 

 separated, in front of the entoplastron, which forms an obtuse or 

 a right angle ; plastral callosities well developed in the adult (hyo- 

 hypoplastral and xiphiplastral), and coarsely sculptured like the 

 bones of the carapace. Dorsal skin of young with longitudinal 

 ridges of small tubercles. Head moderate ; postorbital arch very 

 narrow ; mandibular symphysis with a strong median ridge. 

 Olive-brown above aud on the chin ; head and chin with numerous 

 yellow spots, the largest of \\ hich are below the temple ; dorsal 

 disk of young light-dotted, usually with a few large blackish spots, 

 or with a black transverse band. 



Length of disk 500 millim. A specimen from Kuala Lumpur 

 measures 605 in length aud 565 in breadth over the curves of the 

 bony carapace. 



Burma and Cochinchina to the Malay Peninsula and Archipelago. 



Very common in slow-flowing and muddy rivers and estuaries 

 and in ponds and s^\"amps, and attaining a very large size. 

 Apparently the commonest Trionyx in the Malay Peninsula. 

 Although chiefly carnivorous, will feed on rice in captivity. 



Genus PELOCHELYS. 



Gray, P. Z. S. 1864, p. 89. 



Like Trionyx, but jaws weaker, postorbital arch broader, as 

 bi'oad as the diameter of the orbit, aud proboscis very short. 

 A single species. 



8. Pelochelys cantoris. 



Cldtra indica, part., Gray, Cat. Tort. p. 49 (1844); Giinth. Rept. 

 Brit. Ind. p. 50, pi. vi, fi-j. C (1804). 



