Fig. 3.8. Heart of Ligia oceanica; (a) View of the Heart from the Ventral 



Side, Showing Arteries and Alary Muscles; (b) Inner Surface of the 



Heart, Showing Nerves and Ganglia 



gc, nerve cells in nerve trunks; nc, nerves connecting local system with c.n.s.; os, ostia. 

 (From Alexandrowicz (1).) 



Cardiac 

 ganglion 



Lateral 

 nerve 



Fig. 3.9. Heart of King Crab Limulus, Showing Arrangement of Nerves 



7-8, cardiac nerve from brain; 9-11, cardiac nerve from abdominal ganglia. (From 

 Carlson.) 



m.a. — 4* 



