154 The Alligator and Its Allies 



a pair of thickened lips, called by Chaffanjon 

 "semilunar valves." 



The walls of the smaller part of the stomach are, 

 as might be expected, much thinner than those of 

 the larger region, but they are proportionately 

 fairly thick and are internally thrown into numer- 

 ous folds. 



THE INTESTINE 



In the intestine three regions may be distin- 

 guished: a long, considerably coiled small intestine; 

 a wide, nearly straight rectum; and a short, wide 

 cloaca. 



The small intestine. Fig. 34, s, is of moderate and 

 rather uniform diameter, though somewhat thicker 

 near the stomach, and is not coiled so extensively as 

 figured by Chaffanjon. Near the stomach it re- 

 ceives the ducts of the liver and pancreas. The 

 bile duct, Fig. 34, bd, is a continuation of an elon- 

 gated bile sac, bs, which lies between the large right 

 and smaller left lobes of the liver, /. The two 

 main lobes of the liver, which appear smaller than 

 in reality because of foreshortening in drawing, are 

 connected, across the base of the oesophagus, by a 

 narrow transverse band. 



The pancreas, pa, which is of fair size, lies 

 partly dorsal to and partly in a narrow loop of the 

 intestine, so that it is not very evident in a ventral 

 view of the animal, 



