PLATE V. 



FIG. 8. Is from a general lateral dissection of a small Lefisosteus tristcechus 

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

 removed. X f- 



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

 pound Lefisosteus osseus. X f 



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

 sinus. X f 



'34 



