782 EEPTILIA. 



does not appear to attain the development that distinguishes it in the other species, 

 and, unlike any of the other species, the external process is directed rather outwards 

 and backwards than outwards and forwards. The anterior conjoint margin of the 

 xipliiplastrals is transverse and twice as broad as the conjoint posterior margins, the 

 two halves of which form an obtuse angle much the same as in adult U. punctata. 

 These plates, as abeady stated, are proportionally large for the species which 

 appears to be the smallest of all. 



The stomach in tliis genus is not more dilated than the oesophagus, or than the 

 small intestine at its beginning, and it is not so wide as the large intestine. The 

 first third is directed obliquely across the abdomen from right to left, lying, however, 

 on the left side of the mesial Hne. Its middle third is nearly longitudinal, and its 

 latter third is almost transverse, and the pyloric end, which is- slightly contracted 

 and thickened, appears in the visceral cavity well to the left of the mesial line. 

 In opening the abdomen, the coUs of the intestine are seen arranged in three 

 concentric circles with the transverse portion of the large intestine appearing 

 between the duodenal fold and first part of the second circle. On removing the 

 intestines entire from off the vertebral column and carapace, and turning to the 

 back, two other concentric complete circular folds are observed, the innermost 

 fold beginning at the left side with the others external to it, the transverse colon 

 terminating on the left side, to the right of the pylorus. There is no caecum, and 

 the total length of the small intestine measures 3 feet 3 inches, and the large 

 intestine 6J inches, in an animal 8"'75 in length. 



Two inches behind the larynx, the oesophagus is covered for about an inch with 

 rather long triangular flat villi, the surface of the pharynx anterior to that locality, 

 and the tongue and roof of the mouth being covered with similar but much 

 smaller structures. The rest of the oesophagus, the pyloric third of the stomach, 

 and the most contracted portion of the small intestine are marked with fine 

 longitudinal folds. The remainder of the digestive tract, with the exception of 

 the large intestine, is smooth and of nearly equal breadth throughout, and were 

 it not for the narrow pylorus, there would be no indication either of stomach, 

 oesophagus or small intestine, but merely a continuous tube. The right lobes of 

 the liver are proportionally much larger than in Batagur, and the bile duct is large, 

 but I have not been able to detect its opening in the intestine. The lung is stronger, 

 but quite as large as in the BataguridoB. There are two bronchi, one to each side. 

 The lung is more or less oblong and tliick on its external two-thirds, but very thin 

 internally, its lower border being in close contact with the testicle and kidney. 



The penis, which lies in the post-caudal dilatation of the cloaca, is large, com- 

 pressed from above downwards, the glans consisting of two equal semi-ovals, placed 

 in apposition, like a bilobate leaf, the tip being slightly pointed. It is deeply 

 concave on its under siuface, which carries two rather long conical filamentary 

 processes, one before the other, the anterior pair of which are the longest, and 

 situated at the distal end of the proximal or basal tliird of the glans. These two 

 processes are widely separated from each other, and opposite to them the m-inarv 



