PLATE V. 



Fig. 8. Is from a general lateral dissection of a small Lepisosteus tristcechus 

 as seen from the left side. Most of the opercular and shoulder girdle regions 

 removed. X I- 



Fig. 9. Diagram of the left pericardial sinus and connections from a 10- 

 pound Lepisosteus osseus. X f • 



Fig. 10. Same specimen as above, showing opposite or right pericardial 

 sinus. X f • 



