CHELONIA. 775 



bones, ten to twelve in number, PL Ixxv, fig. 11, wliich constitute a strong sup- 

 porting ring to the sclerotic. The temporal fossa has a rather acutely pointed 

 anterior superior border, while in B. lineata and B. duvaiicelli the same border is 

 obliquely transverse and broad. 



As in B. lineata, the lower jaw has a longitudinal groove between the pos- 

 terior symphysial margin and the post-alveolar ridge, but instead of stopping short 

 where it meets the angle of junction of the ridges of the opposite sides, it is 

 prolonged forward between them, terminating on the symphysis, while in B. lineata 

 the ridges unite ; a sharp but short ridge occurring at the angle of union, which is 

 the case also in B. duvaucelli, only in that species there is no groove posterior to the 

 post-alveolar, which has only a single narrow surface behind it nearly on its o^vn 

 level. The groove behind the inner ridge of the lower jaw has a well-defined inner 

 border in B. baska, whereas, in B. lineata, this border is not upraised, and there is 

 consequently no true posterior groove, but only a broad shelf of bone. 



In this species and B. lineata, there is a concavity on the outer surface below 

 the alveolar border corresponding to the surface on which the superior maxillary 

 rests, but in B. duvaucelli no such concavity exists. 



The skull of the large individual from Khyouk Phyoo measuring 5"*45 in extreme 

 length and 3"-10 in width below the ear is fully adult, as the sutures on the anterior 

 portion of the upper surface of the head are disappearing ; and since the skeleton 

 presents every appearance of full maturity, the dimensions given under that speci- 

 men may be regarded as indicating the limit of growth of the female. 



The first vertebra after the eighth dorsal is applied by its transverse process 

 in the same way to the eighth costal plate as occurs in B. lineata, but the nodosity 

 so formed is applied to the ilium before the transverse processes of the first of the 

 true sacral vertebrae, of which there are only two with distinct transverse processes. 

 The transverse processes appear in the fifth and disappear in the fifteenth caudal 

 vetebra. In a female there are 27 tail vetebrse. The axillary and inguinal septa 

 are developed almost to the same extent as in B. baska. 



The tongue is very small, not more than half an inch in length, and is 

 marked by a longitudinal furrow, as in Battirgidce generally, leading to the laryngeal 

 orifice which is almost exactly below the posterior nares. The larynx is thus 

 placed much anteriorly. The surface of the mouth, and the oesophagus for 

 three inches behind the larynx, are covered with large and numerous rounded 

 villiform processes. The tubular intestiniform stomach is stretched across from 

 side to side between the anterior septa of the shell. Entering the visceral cavity, 

 at the upper end of the left septum, it passes a short way backwards and then 

 stretches across to the posterior margin of the right septum, from which it is 

 separated by the narrow transverse lobe of the liver. It then turns backwards, 

 and, when opposite the gall bladder, it is covered anteriorly by the right division 

 of the Hver, which arches over it, and from that point its backward curve is inwards. 

 The left lobe of the liver embraces anteriorly the oesophageal portion of the stomach 

 and lies^in^the lesser curvature. The total length of the greater curvature in one 



