748 EEPTILIA. 



appears to be an example of B. lineata, and the former appears to be the specimen 

 refeiTed by Theobald' to B. lineata, but which is distinct and probably B. iravadica. 

 The following are the characters of the female of this species : — 

 Snont short, and not upturned as in B. baska, concave from before backwards 

 between the eyes. Eyes rather prominent and directed outwards ; iris dark or light- 

 brown, without any speck. Head broad between the eyes and across the ear, much 

 broader behind than B. baska. Upper surface of the head, behind the eyes and over 

 the ear, covered with moderately sized shields. A large shield below the angle of the 

 mouth, with some small scales behiad it. Ear rather large. Skin of the neck and 

 limbs finely granular. The toes are broadly webbed, and the anterior surface of the 

 fore foot covered with narrow long separated scales or shields, those on the middle and 

 inner side of the limb being the largest, with three or four large round scales on the 

 flap above the fifth toe of the front foot. The upper surface of the toes with large 

 transverse scales. The sole with small round separate scales, with three long narrow 

 transverse j)lates behind these, and succeeded by smaller scales of a similar nature. 

 A patch of enlarged transverse scales along the upper and under surfaces of the 

 margin of the hind limb, with enlarged transverse scales on the upper surface 

 of the toes, and rounded small scales on the sole ; claws rather short, brown at 

 the base and yellow at the tips. The tail consists of 23 vertebrae, and extends a 

 short distance beyond the carapace. The skin is granular, and there is a lateral line 

 on either side of its upper surface, of almost spiny granules larger than the others. 

 The under surface of the tail, behind the vent, bears two lines of rather large flat 

 tubercles. 



The shell has a vertebral ridge, and is a rather long oval, its margin sHghtly 

 expanding from the sixth to the seventh marginals, but rounded ofi' from the 

 hinder margin of the last plate, with the margins in this region very slightly upturned. 

 It is a much narrower oval than B. baska, and the margins are much less reverted, 

 and the shell is much less expanded posteriorly. There is also an absence of the same 

 fullness over the first vertebral that distinguishes B. baska, but, in the rounding and 

 fullness of the anterior portion of the carapace, there is considerable variation due 

 to individual peculiarities, and not to sex. The sides of the carapace over the first and 

 second costals are occasionally almost flat, while in others they are distinctly convex. 

 The shell slopes gradually downwards and backwards from the hinder margin of the 

 second vertebral, and the costal region in that portion of the shell is very feebly 

 curved. The nuchal is triangular, with a broad posterior base in young and adolescent 

 individuals, but, in the adult before me, it is considerably narrowed posteriorly and is 

 broader in front than behind. The first vertebral has divergent lateral margins as in 

 B. baska, whilst in B. duvaucelli the margins are more or less contracted in the middle. 

 It is hexagonal, with a concave posterior margin, the concavity being directed back- 

 wards. Its nuchal border, in some, slightly exceeds the length of its first marginal 

 border, while in others this proportion is reversed. The first marginal border is some- 

 times about one-half the extent of the first costal suture and at other times longer. 



' Journ. Linn. Soc, Tol. x, 1868, p. 16. 



