Fig. 3.20. Pericardial Organs of Cancer pagurus 

 (a). Organ of right side; vein-openings are indicated by dotted lines, n. mot, motor 

 nerves; n. dors, dorsal nerve of the heart; (b), ramifications of a nerve fibre to form a 

 neuropile in the pericardial wall (from Alexandrowicz (2).) 



