Lymphatics and Enteric Epithelium of Amia Calva 373 



lymph from the anal and pelvic fins. The sinus at the base 

 of each of these fins is smaller than the one at the base of the 

 pectoral. As the vessel approaches the heart it increases in 

 size measuring, in a large specimen, about a centimeter in 

 diameter at the point of bifurcation. The two branches into 

 which it divides merge into the large pericardial sinus which, 

 as already stated, communicates with the sinuses of the 

 lateral lymph vessels and thence with the veins. Possibly 

 there are other openings from the pericardial sinus into the 

 veins but none were observed. In one instance an anas- 

 tomosing branch was found extending from the large vessel at 

 the base of the caudal fin, to the lateral lymphatic, joining 

 the latter just as it turns toward the meson (Fig. 11, t). 



The dorsal lymphatic vessel extends along the dorsimeson 

 from the caudal end of the body to the base of the cranium. 

 At the caudal end, as already indicated, it anastomoses with 

 the lateral lymph vessel, joining it just after the latter turns 

 at right angles to its longitudinal course, to enter the caudal 

 sinus. Whether the dorsal vessel bifurcates into symmetrical 

 branches at its caudal end, can not be positively stated. It is 

 believed, however, that it does. In one specimen a branch 

 was found on either side. At the cephalic end the vessel bi- 

 furcates at the base of the cranium, each branch extending 

 laterad to join the large lymph sinus, on either side, which 

 has already been described as extending to near the base of 

 the orbits and into which the lateral lymphatics open. Along 

 the base of the dorsal fin the vessel is somewhat larger than it 

 is farther cephalad. From the relative size of the two ex- 

 tremities of this lymphatic, one might judge that the course 

 of the lymph was caudad, i. e., that this vessel emptied at its 

 caudal rather than at its cephalic end. The fins are well sup- 

 plied with lymphatics. According to Trois (22), there are two 

 quite large vessels at the sides of each fin-ray. The vessels 

 of adjoining rays are connected by innumerable small anasto- 

 mosing branches. 



The viscerai< i,ymphatics. 



The anastomosis of the visceral with the subcutaneous 

 lymphatic system appears to be slight. Only a few of the 



