DESCRIPTION OF THE FIGURES. 



Figs. 1 to 9 were drawn to a scale from dissections of injected specimens ; 

 10-24 are from a transverse series tbrougJi the tail region of a 90 mm. 

 Lepisosteus osseus; and Fig. 25 Is taken from a cross section of the lateral 

 trunk from an adult L. osseus. In general, the subcutaneous or so-called 

 lymphatic canals are colored yellow or drawn in outline, the arteries are 

 stippled, and the veins cross-barred. A vessel drawn in dotted outline 

 signifies that it passes within or behind a muscle, bone or other vessel. All 

 outlines for the microscopic drawings were made with the aid of a camera 

 lucida and the details were filled in afterward. 



Fig. 1. Represents a lateral dissection of the tail region of a small 

 Lepisosteus tristcechus as seen from the left side. The myotomes bordering 

 the tail are removed in order to best portray the lateral trunk emptying into 

 the left caudal sinus, the connection of the latter with the corresponding 

 right sinus, and the termination of the left caudal sinus in the caudal vein, 

 together with the origin and course of the vein. The outline for this drawing 

 was traced from a photograph and the details were filled in afterward. X %• 



Fig. 2. Is a similar dissection from the opposite or right side of the same 

 specimen as Fig. 1. On this side the dorsal, hsemal and lateral trunks fuse 

 to form sinus (x), which with the caudal trunk terminates in the right 

 caudal sinus, and the latter empties into the caudal vein. The distribution 

 of the caudal artery is also shown, and, like Fig. 1, the dissection was first 

 photographed and the details were filled in afterward. X %• 



