Dr. J. E. Gray on Chelonians. 299 



Eryma. 



Upper jaw with flat alveolar plates, which are broad 

 behind, much nan-owcr in front, and separated from each other 

 by an impressed space. Lower jaw with a broad, concave, 

 alveolar sm-face with a raised edge on the inner side and a 

 much more raised edge on the outer side. 



Pseudemys concinna. 



The colouring of the head and neck is moderately permanent ; 

 but the colouring of the back of the shell and underside of 

 margin differs very considerably, and almost appears to be of 

 a different type in each of the five specimens in the British 

 Museum. 



Damonia macrocepJiala. 



Young shell with a central space, which diminishes into a 

 small rhombic one in the half-grown animals. Sternum of 

 young shell brown, with a whitish keel on each side. Older 

 shells white, with a black blotch on each shield. 



The specimens first described were only half-grown ; and 

 there are three very distinct keels, and the first dorsal is square. 



In the skeleton of an old specimen called Eniys subtrijuga, 

 from the Leyden Museum, the middle of the back has a slight 

 central keel ; and the lateral keels are very blunt, nearly 

 obliterated, only making the middle of the back lower than 

 the rest of the shell. The nuchal plate is generally much 

 broader behind than in front. 



Damonia ohlonga. 



The colouring of the head and beak of the specimen from 

 Batavia, which I have described under the name of Damonia 

 ohlonga (Ann. & Mag. Nat. Hist. 1871, viii. p. 3G7), is so ex- 

 ceedingly like the other specimens of Damonia macrocepliala^ 

 that I am inclined to consider it either a local or accidental 

 variety of that species, having a much narrower oblong body 

 and shell. 



Damonia Reevesii. 



Shell of adult animal very thick, about 4 inches long, 

 and the vertebral antl costal bones under the keels much 

 raised : indeed they produce the tubercular keels ; for the plates 

 over them are comparatively thin and only conformable to the 

 bones beneath. The first vertebral shield nearly as broad as 

 long, and scarcely contracted on the sides ; the thin discal plates 

 have a few obscm'c pale rays, most distinct near the margin. 



