PLATE VII. 



Fig. 13. Ventral view of the same Leptsosteus tristcechus as Figs. 8 and 11. 

 Shows the termination of the ventral lymphatic trunk in the pericardial sinuses 

 and the union of the latter in a dorsal pericardial sinus, which lies directly above 

 the bulbus arteriosus and communicates with the inferior jugular above. X t- 



138 



