PLATE V. 



Fig. 8. Is from a general lateral dissection of a small Lefisosteus trisfa'c/itis 

 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 §• 



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

 sinus. X f • 



