300 Dr. J. E. Gray on Chelomans. 



The sternum is quite flat. Tlie spots on tlie side of the nose 

 are very distinct and slightly convex. The margin is much 

 contracted at the openings, especially the hinder one, as in 

 the Bataguridfe, The vertebrse are very small and slightly 

 raised, and easily separated from the costal plates. 



Graptemys pseudogeographica. 



The head with a streak between the nose and each eye, and 

 with a curved line behind each eye ; the streak varies greatly in 

 width and distinctness, but is always present. The back of tlie 

 shell varies in height ; but in some the back is sloping but flat on 

 the side, and much elevated in the middle, forming a kind of 

 penthouse. The claws vary greatly in length : in some only 

 the three middle front claws are lengthened ; but in other spe- 

 cimens all the claws, before and behind, are much lengthened 

 and slender. 



Kachuga trilineata. 



Nuchal shield broad. Sternum of young shell with four 

 square unossified spaces. Dorsal plates well developed ; lateral 

 plates with nine unossified spaces on each side. Claws 5.4. 



Kachuga dentata. 

 Nuchal plate broad. 

 Batctffu?- lineata '*d," Gray, Cat. 36. 



Hob. South India, river Kiatna [Elliot). 



Known from the young of K. trilineata, because that has 

 the sternum much sooner ossified, and has a brown spot on 

 each vertebral plate, and a small brown spot on the hinder edge 

 of each costal plate. 



Kachuga major, Hand-list Sh. Rept. p. 51. 



Nuchal shield linear, very narrow. 



Hob. India? 



Only known from a very young specimen of a large species. 

 Tlie specimen, 4| inches long, has the ribs linear, very thin, 

 only very slightly ossified near the vertebras. The sternum 

 has three square spaces unossified. In a much larger speci- 

 men this part is more ossified than in smaller specimens in the 

 Museum. 



Ocadia sinensis. 



An adult specimen, 8| inches long, from Formosa is black 

 and bluntly three-keeled, which is scarcely apparent in the 

 t\\ o adult specimens that lived for a long time in the Zoolo- 



