10 



TRIONXCHIBJE. 



and vermiculate like the bones of the carapace. Dorsal skiu of 

 young with longitudinal ridges of small tubercles. Head moderate ; 

 postorbital arch somewhat more than half the diameter of the 

 orbit in the adult ; mandibular symphysis without median ridge. 

 Olive-brown above and beneath ; head, neck, limbs, and border of 

 shell light-dotted ; head with large yellow spots, viz. across the 



Fig. 4. — Trionyx hnrum (young). 



snout, behind the orbit, at the angle of the mouth, and on the 

 chin, these markings becoming indistinct in the adult, the head of 

 which is more or less closely spotted or vermiculated with black ; 

 dorsal disk in the young with dark marblings and four or sis very 

 large ocellar markings. 



Length of disk 400 millim. 



Bengal. Recorded from Penang by Cantor. 



6. Trionyx phayrii. 



Theobald, Journ. Linn. Soc. x. 1868, p. 18 ; Anders. Journ. Asiat. 

 Soc. Bengal, p. :?0 (1871); Bouleng. Cat. Chelon. p. 251 (1889) ; 

 id. Fami. Brit. Ind., Kept. p. 14 (1890). 



Similar to T. hnrum, but a single neural plate between the first 



