THE CARDIAC NERVES AND GANGLIA. 



201 



FIG. 115. The heart and adjacent organs of an adult Limulus, showing the ostia; principal blood-vessels; 

 ganglionated median nerve, m.c.n.; the cardiac plexus; the pericardial nerves, P.M.; the lateral, l.c.n., and seg- 

 mental cardiacs, s.c.n. 6-13. From Patten and Redenbaugh; slightly modified. 



