PLATE III. 



FIG. 4. Shows the course of the hyo-opercularis lymphatic trunk and its rela- 

 tions with the corresponding superficial branches of the hyo-opercularis artery 

 and vein, as seen from the right side of a 15-pound Polyodon. X f 



FIG. 5. Ventral view of the termination of the branchial lymphatic trunks 

 (Nutrient branchial veins?) in the inferior jugular. 25-pound Polyodon. 

 Natural size. 



130 



