306 Dr. J. E. Gray on Chelonians. 



Mesoclemmys gibha. 



Hydraspis gibha, Gray, Cat. Shield Kept. 



Platemys gibha, Dum. & Bib. Erp. Gen. ii. p. 416, t. xx. fig. 2 ? (bad). 



Hah. "Madagascar" (Parzudaki) j South America {Bihron). 



STERNOTHiERUS. 



Some specimens have a rather concave or flattened sternum, 

 perhaps males ; they appear to have the anal shields larger 

 and more produced. Others have the sternum slightly convex, 

 and the anal plates not so much produced as in the female and 

 young land-tortoises. 



Sternothcerus sinuatus, with the broad first vertebral, has the 

 sternum very intense uniform black. 8. Derbianus, with the 

 narrower first vertebral shield, has the sternum black on the 

 margins and more or less white in the centre of the disk. 



Trionyx ? Dillioynii^ Hand-list Sh. Kept. p. 79. 



Head and body olive, uniform white beneath. Dorsal disk 

 Avith close longitudinal, rather converging, rows of small 

 granules. Head above olive, with several uniform narrow 

 streaks becoming rather broader behind : — one from the side of 

 the nose along the border of the upper lip, edging the white of the 

 front of the throat; the second extending from the tip of the nose 

 to the eye, through the eyelids, to the outer angle of the eye, 

 and bent down behind over the tympanum. A central streak 

 commencing before and extending between the eyes to the 

 occiput, and with a branch on each side just behind the eyes, 

 which is widened and extended on the upper part of the side 

 of the neck. 



Hob. Borneo [Gutter). 



This species is very distinct in the colouring of the head ; 

 and as there is only a single specimen, I cannot have the head 

 extracted. 



We have lately received a beautiful skull of Isola pegu- 

 ensis from Borneo ; but that is at once known from this 

 species by the head being minutely and uniformly dotted with 

 white. 



Emyda. 

 The synonyraa of the two species are very much confused. 



1 . Emyda granosa. 



The hinder callosities oblong and oblique, and diverging 

 with reorard to each other. 



