Subcutaneous Vessels in Tail of Lepisosteus 75 



K. C, red corpuscles. 



R. C. A., right caudal artery. 



R. C. S., right caudal sinus. 



R. Cau. S. O., right caudal sinus opening into the caudal vein. 



R. Cau. S. v., semi-lunar valves guarding the entrance of the right caudal 



sinus into the caudal vein. 

 R. Hge. T.. right longitudinal hfemal trunk. 

 R. Lat. X.. ramus lateralis vagi. 

 Uro., urostyle. 



Ver., vertebral column or centrum. 

 y. T., ventral subcutaneous trunlv. 

 Wi. C, white corpuscles or leucocytes. 

 X., a sinus in Lepisosteus formed by the union of a lateral, hfemal and 



often the dorsal trunk, which terminates in one of the caudal sinuses. 



