Rl 



l&ngest pair of norves pass backwai-ds under t!ie visceral, 

 and divide each into two pai-ts. The one, somewhat larger 

 than the other, passes dorsally to enter, and be lost .in 

 the mass of the visceral £;;anglia. The other passes later- 

 ally to innervate the osphradium. 



The visceral ganglia proper of the adult (figs. 10, 

 60), along with the greater development of the posterior 

 part of the body innervated by them, have attained greater 

 comparative size than the cerebral and pedal. They form 

 a somewhat three lobed mass, in which the larger, central, 

 part consists of the completely fused visceral ganglia of 

 the larva, v^hile the lobe on either side consists of the 

 respiratory ganglia v;hich have come to lie adjacent to the 

 visceral proper. 



From the visceral ganglia several pairs of nerves 

 are given off, whose connection with the visceral is 

 through the lateral masses (fig. 60). Passing forwards on 

 either side are two small nerves (figs. 50,1,2) which ac- 

 company the kidneys and anal canal, which innervate the 

 posterior adductor and the anterior part of the mantle. 

 Given off slig^itly posterior to tl.em, a large nei've (3) 

 goes directly to the middle part of the mantle. Posterior- 



