28 TESTUDINIDJB. 



Var. edeniana. 



Melanochelys edeniana, Theob. Cat. p. 12. 



Emys trijuga, var. burmana, Anders. An. Zool. Res. p. 729, pis. Ivii 

 & Iviii. 



A larger race, with the shell deep black, the plastral border, 

 and sometimes also the keels, yellowish. Light markings on the 

 head, if present, small. 



Length of shell 16 inches. 



Hob. Burma. 



25. Nicoria tricarinata. 



Geoemyda tricarinata, Blyth, J. A. S. B. xxiv, 1855, p. 714. 



Chaibassia tricarinata, Theob. Cat. p. 6. 



Chaibassia tricarinata and theobaldi, Anders. An. Zool. Res. Yunnan, 



pp. 717, 718 ; Bouleng. Cat. Chel 8?c. pp. 139, 140. 

 Nicoria tricarinata, Lydekker, J. A. S. B. Iviii, 1889, p. 327, fig. 



Allied to the preceding species, but of more terrestrial habits, 

 as indicated by the more convex carapace, abruptly descending pos- 

 teriorly, and the very indistinct web between the digits. Scales 

 on the limbs larger. The hypoplastron is frequently attached to 

 the carapace by ligament; no inguinal shield. Carapace dark 

 brown or black, with the three keels yellow; plastron uniform 

 yellow ; head black, with a broad yellow or reddish band on each 

 side passing over the eye and the tympanum; a narrow similar band 

 below the angle of the mouth, along the inferior margin of the lower 

 jaw ; neck and limbs blackish. 



Length of shell 5 inches. 



Hob. Bengal (Chaibassa) and Assam (Bisthnath Plain). 



I have recently had an opportunity of examining specimens of 

 0. tricarinata and theobaldi, and regard them as belonging to one 

 species, which cannot be generically separated from N. trijuga. 



Genus CYCLEMYS, 

 Bell, P. Z. S. 1834, p. 17. 



Neural plates mostly hexagonal, posterior lateral margins shortest. 

 Plastron united to carapace by ligament, and more or less distinctly 

 divided into two lobes moving upon a ligamentous hinge between 

 the hyo- and the hypoplastra; both the latter bones contributing 

 to the formation of the bridge; entoplastron intersected by the 

 humero-pectoral suture. Skull with a bony temporal arch ; 

 alveolar surfaces without median ridge ; choanae between the eyes. 

 Upper surface of head covered with undivided skin. Digits webbed 

 or nearly free. Tail short, not longer in the young than in the 

 adult. 



Distribution. The greater part of the Oriental Eegion, east of the 

 Bay of Bengal. Terrestrial or semiaquatic. 



