Lymphatics and Enteric Epithelium of Amia Calva 375 



in diameter at its widest point. It extends nearly as far cau- 

 dad as the cholecyst. The cephalic half is covered by the left 

 lobe of the liver ; the other half by the cholecyst, to which it 

 is closely united. Several ducts open into the caudal end of 

 the sinus. One duct passes obliquely across the dorsal side of 

 the duodenum and pyloric end of the stomach, and joins the 

 left lymphatic sinus at the apex of the interval between the 

 oesophageal and pyloric portions of the stomach, z. e., near 

 the caudal end of the sinus. This is the only communication 

 that was found between the two sinuses. Another lymph duct, 

 much larger than the preceding, passes ventro-caudad be- 

 tween the pyloric portion of the stomach and the duodenum. 

 Upon reaching the ventral side of the latter it extends directly 

 caudad as far as the spleen where it divides into several small 

 branches which accompany the blood-vessels along the sides 

 of the intestines ; along some of the folds of the intestine as 

 many as three lymphatic vessels were found. As the duct 

 reaches the ventral side of the duodenum, it gives off a small 

 branch to the ventral wall of the stomach ; the diameter of 

 the main duct itself, along its cephalic portion, is fully ^-2 c. m. 



The last to be mentioned of the three abdominal sinuses, is 

 situated on the right side, along the walls of the air-bladder 

 and stomach. It is fusiform, measuring in a specimen 42 c. m. 

 in length, a little over 7 c. m. from end to end and about i 

 c. m. in diameter at its widest point. It opens into the right 

 lymph sinus, on the dorso-lateral side, near the base of the 

 cornu of the air-bladder. There appears to be no valve at 

 this orifice ; the injecting material, as well as air, readily 

 passed from the one sinus into the other. At its caudal end 

 it anastomosis with one of the ducts extending along the 

 duodenum ; many small branches enter it from the stomach 

 and air-bladder. The lymph from the right and left lobes of 

 the liver enters the corresponding sinus. In only one or two 

 instances were trabeculae seen in the lumen of these sinuses. 

 Some of the vessels of the intestines anastomose with the 

 peripheral lymphatic system at the caudal end of the abdo- 

 men. 



As stated before, the large fusiform sinus lying along the 



