DISTRIBUTION OF LYMPHATICS IN SCORIVEMCIITHYS 47 



region of the ventral fins between this trunk and the main ven- 

 tral lymphatic trunk. 



In the head region there is the same division into superficial 

 and profundus systems. The superficial facial trunk (Figs. 4 

 and 5, S.Fac.L. V.) takes its origin in the neighborhood of 

 the snout, and following along the upper inner edge of the sub- 

 orbital bones, crosses the prootic process to join the jugular 

 papilla of the cephalic sinus. The profundus facial trunk 

 (Figs. 4 and 5, P.Kac.L.V.) could only be found in the orbit; 

 branches were seen to enter it from the adductor mandibular 

 muscles, and it was traced to a point in front of the prootic 

 foramen, where it probably passed under the jugular and entered 

 the abdominal sinus. This point, however, could not be deter- 

 mined. There are 2 hyoidean lymphatic trunks, which run 

 along the upper and lower sides of the arch (Figs. 3 and 4, 

 A.Hyo. T. and P.Ilyo. T.). Of the 2 the lower is the principal 

 stem. It collects the lymph from the branchiostegal region, and 

 after receiving the upper vessel expands into a sinus that empties 

 into the cephalic sinus. 



With Scorpamichlhys nothing has been done in connection 

 with the lymphatics of the viscera. The main trunk, however, 

 was often injected from the myelonal trunk, and was seen to 

 follow the coeliaco-mesenteric artery and empty into the ab- 

 dominal sinus. The lymph from the reproductive organs was 

 poured into the abdominal sinus through numerous small vessels. 

 In an injected specimen of Ophiodon lymphatic vessels were 

 seen to arise from all the organs and empty into trunks that fol- 

 lowed the courses of their corresponding blood-vessels, often 

 nearly surrounding them. These canals were collected ante- 

 riorly into a main coeliaco-mesenteric trunk that discharged itself 

 in the abdominal sinus, and posteriorly the principal intestinal 

 vessels traveled along with the posterior mesenteric vein between 

 the reproductive organs to culminate in the abdominal sinus. 



3. SUPERFICIAL OR SUBCUTANEOUS LYMPHATICS 

 OF THE TRUNK. 



Lateral lymphatic trunk (Figs. 1, 4, 5 and 6, L.L. V.). — 

 No other of the lymphatic canals of fishes has received the 



