296 Dr. J. E.Gray on Chelonians. 



lanceolate. In the older specimens the front plate becomes 

 more elongate compared with its breadth, and narrowed in 

 front. The second vertebral shield becomes longer compared 

 with its length as the animal increases in age. In one speci- 

 men tlie vertebral plates are very irregular, with two super- 

 numerary plates, and the front plate is broader than long ; but 

 I believe this is only a deformity. 



Dr. C. Giebel, in the 'Zeitsch. gesammt. Naturwissensch.' 

 1866, p. 15, describes a Clemmys dentata, which he says is 

 the same as Emys dentata of my'IUust. Ind. Zool.' ii. t. viii., 

 from the Isle of Banka. He tigui'cs three specimens (t. iii.), 

 exhibiting suj)ernumerary dorsal, or posterior marginal, or both 

 posterior dorsal and posterior marginal plates (t. iii. f. 1-4). 

 See 'Append. Cat. Shield Eept.' p. 22. 



The figures of Dr. Giebel are very like the young specimen 

 of Geoemyda grandis in the British Museum, from Camboja, 

 which has the vertebral plates very irregularly divided. 



In the British Museum there is a specimen of Elseya lati- 

 sternum with additional caudal marginal plates. 



Nicoria Sjpengleri. 



The adult animal is pale above, with a black streak on the 

 outside of the vertebral and costal shields ; the underside of 

 margin and sternum black, with a white streak round the cir- 

 cumference of the fiat part of the sternum. The lateral dorsal 

 keels appear to be wide apart in the young specimens. 



Geoclemmys Milhlenhergii. 



The shell is variously spotted and streaked with black, but 

 leaving a distinct longitudinal pale vertebral streak. 



Glyptemys pidchella. 



The sternum of an imperfect skeleton, prepared by Dr. 

 Giinther, in the British Museum is rather concave the whole 

 of its length. The alveolar surface of the upper jaw is wider 

 than it is in the specimen figured, which may also be a character 

 of sex. 



Emydina. 

 The lower jaw of this tribe oflfers two modifications : — 

 I. The alveolar edge is simple, shelving, acute, with a sharp 

 edge on the outer side. Melanochelys. 



II. The alveolar edge is concave, shelving inwards, with a 

 more or less prominent margin on the inner side and 

 raised sharp edge on the outer side. Emys^ Eryma. 



