86 DR. J. E. GRAY ON THE TRIONYCHIDZ. [Feb. 23, 
I have changed the name of this species because it has been ap- 
plied to a number of species on the Continent, and I have never seen 
a specimen from Java. It is known in the young state from all the 
other species by the broad black streaks radiating on the crown of the 
head; and they are to be seen in the half-grown specimens. 
Potamochelys stellatus. 
The following species, which have four sternal callosities, appear 
to belong to this genus, but I have not been able to examine the 
skulls of them :— 
2. PoraMOCcHELYs? PEROCELLATUS. 
Trionyx perocellatus, Gray, Cat. Tort. B. M. 48; Cat. Shield 
Rept. 65, t. 31. 
Hab. China and Chusan. 
