02 INVERTEBRATE ZOOLOGY 



cerebro-visceral connective, which goes to the visceral ganglia, the 

 cerebro-pedal connective, which goes to the pedal ganglia, and 

 the pallial nerve, which passes to the mantle. Find them. 



The pedal ganglia form a nervous mass buried in the foot 

 near its base. They must be sought by cutting into the foot 

 near its base and may be recognized by their pink color. In 

 contact with them is a sense-organ called the otocyst. 



Exercise 11. Draw a diagram representing the nervous system. 



Make a transverse section with a razor through the region 

 of the heart of a mussel which has been previously hardened. 

 Identify all the organs which appear. 



Exercise 12. Draw a diagram representing the cross section; 

 carefully label all the organs. 



