SG 



TESTCDINIDiE, 



Carapace moderately depressed, with three obtuse, interrupted 

 keels in the young; the lateral keels usually disappearing m the 

 adult • the shields smooth or concentrically striated: nuchal as broad 

 as Ion- or longer than broad ; first yertebral broader ant^noi-ly than 

 posterForly ; second and third yertebrals as long as broad, or broader 



Fig. 23. 



Skull of Ocadia sinensis. (From Gray, P. Z. S. 1873.) 



than long ; posterior margin not serrated. Hind lobe of plastron 

 notched, narro\ver than the opening of the shell, as long as or a little 

 shorter than the width of the bridge ; the longest median suture is 

 that between the abdominal shields, the shortest that between the 

 humerals ; the length of the suture between the pectorals e(]uals or 

 exceeds that of the gulars and humerals together; inguinal and 

 axillary large. Head rather small ; snout obliquely truncate, 

 rather strongly projecting: upper jaw not hooked, feebly notched 

 mesially ; both jaws witli finely denticulated edge ; alyeolar surface 

 of upper jaw broad all round, with a feeble, slightly tubereulate 

 median ridge ; the width of the mandible at the symphysis much 

 less than the horizontal diameter of the orbit. Digits broadly 

 webbed. Tail about two thirds the length of the shell in the young, 

 half in the males, two fifths in the females. Carapace oliye-browu, 



