1. TRIONYX. QA7 
keel on its outer surface ; mandibular symphysis narrower than the 
diameter of the orbit, without median ridge. Brown above, yel- 
lowish beneath and on the sides of the neck; head and neck with 
yellowish dots; some young with an oblique dark streak behind 
each eye. 
Length of dorsal disk 25 centim. 
Malay Peninsula, Sumatra, Borneo, Java. 
Fig. 65. 
Skull of Trionyx subplanus. (From Gray, P. Z. 8. 1864.) 
a. Her., stffd. Singapore. Gen. Hardwicke [P.]. 
b. Her., stffd. Singapore. A, R. Wallace, Esq. [C.]. 
(Type of 7. frenatus.) 
ec. Her., skull. Singapore. 
d. Yg., spir., skull Pinang. Dr. Cantor. 
separate. 
e. Yg., spir., skull _ Java. Leyden Museum. 
‘separate, 
