154^ EEPTILIA. 



of the quadrangular section liave peritoneal attacliments. The cystic portion is 

 the largest, concave internally, convex on its outer side, and almost flat ventrally. 

 It has a pointed conical anterior end, posterior to which, on its inner side, it is joined 

 by the most anterior portion of the transverse lobe. The gall bladder is situated 

 in the lower third of the concavity, and is placed dorso-ventrally, its apex appearing 

 on the ventral aspect. The cystic lobe is attached over the lung, all along its 

 external border, with the exception of about two inches in its lower portion, and 

 the attachment runs round its conical anterior end, and is continuous with the 

 peritoneal fold of the transverse lobe. The third division is more or less quadran- 

 gular, and is the most dorsal of the divisions, and is connected to the dorsal surface 

 of the apex of the cystic lobe, where it is also united to the transverse lobe. 

 All its margins are attached, and it sends down a long narrow ribband of liver 

 substance along the vena cava. The gall duct is rather long and narrow, and after 

 a course of 3 "75 inches it reaches the intestinal wall, along which the duct runs 

 for 1'75 inch before it opens internally. There is no perceptible thickening of 

 the mucous coat of the wall of the intestine where the duct joins it, as in ^. thurgi. 

 The bile is a very dark blackish-green. 



The allantoic bladder has the attachments common to this viscus, its sides 

 and fundus being quite free. It is partially divided, and is capacious, but not so 

 much so as the bladder of B. baska, wHch is attached to the Hver on both sides. 

 The cloacal bladders are large, but with very delicate walls, devoid of the villous 

 processes of B. baska, the mucous membrane being thrown into a fine mesh work 

 of loose delicate folds. The internal lobes of the clitoris are blackish-purple, and 

 closely resemble those of B. baska. The peritoneal canal is wide, and terminates 

 external to the lobes of the clitoris according to my observations.^ The inner side 

 of its wall is marked by fine fibrous transverse short bands, with intervening spaces. 

 The ovaries are yellowish, and about five inches long in one female, which, 

 although so large, was apparently a virgin. The oviduct was eight inches long and 

 had never been dilated. 



The lung is much longer than the lung of B. baska, from wliich it is also 

 distinguished by the most anterior external lobe being deeply divided from the one 

 behind, and longer than in B. baska. The posterior sac of the inner border is also 

 much longer than in that species, the two terminal lobes of the two borders being 

 long sacs. 



This species, as will be observed from the foregoing tables, attains to a consider- 

 able size, nearly equalling in dimensions the allied form B. baska. It is, however, 

 apparently comparatively rare in the Sunderbunds of Bengal, whence it is brought to 

 Calcutta along with Batagur tlmrgi and B. baska to be sold as food to low caste 

 Hindoos. It is more plentiful in the north-western portion of the Gangetic system, 

 extending into Nepal, and it is probably the large species found in the Nerbudda, 

 and is doubtless one of the forms occurring in the Godavery. Like B. baska, it 

 has none of the fierce snapping habits of the Trionycidce, although it occasionally 



■ Joum. Linn. Soc, Vol. xiv, p. 441. 



