1. Tuioxrx. 



247 



keel on its outer sui'faco : mandibular symphysis narrower than the 

 diameter of the orbit, without median ridge, lirown above, yel- 

 lowish beneath and on the sides of the nock ; 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. 



'^^^ 



Pig. 65. 



Skull of Trionyx suhplanus. (From Gray, P. Z. S. 18G4.) 



a. Ilgr., stffd. 

 h. Hgr., stffd. 



c. Hgr., skvdl. 



d. Yg., spir., sliidl 

 separate. 



e. Yg., spir., skull 

 separate. 



Singapore. 

 Singapore. 



Singapore. 

 Piuaug. 



Java. 



Gen. Hardwicke [P. 

 A. E. Wallace, Esq. '[0.]. 

 (Type of T.'frenatus.) 



Dr. Cantor. 



Leyden Museum. 



