(n 



the lamella alternating with the internal one. Soon after 

 attaining 1 the ventral surface of the liver, the visceral 

 nerve gives off a large, much-branched nerve to the 

 anterior vena cava. This runs down along the wall of the 

 vessel to about the level where the ink duet enters the 

 visceral mass (tig. 69). A second branch runs out from 

 the main nerve, over the visceral envelope, and ends in 

 small branches to the depressor of the funnel. On its 

 way, this nerve gives oft' several branches to the visceral 

 envelope, and while that of the right side furnishes a long 

 branch to the bent region of the intestine, that of the left 

 sends a fine branch to the rectum (fig. G9). The visceral 

 nerve, during its course over the liver, gives off many fine 

 branches to that organ, to the ink sac, to the kidney wall, 

 &c. Nerves may also be seen running to the rectum and 

 the septal muscle. 



B. (()) The Pallial Nerve is a broad flat nerve 

 given off from the posterior dorsal angle of the anterior 

 visceral ganglion (fig. 70, Pall. N.). Running posteriorly 

 and outwards, it pierces the membranous posterior 

 cranial wall, and so enters the visceral sac (fig. 82). 

 On entering the visceral sac it runs outwards and 

 posteriorly along the inner wall of the visceral envelope, 

 towards the great lateral muscle, giving several branches 

 to the envelope in its course. Then it runs obliquely 

 through the lateral muscle, to terminate 1 in a large fiat 

 triangular star-shaped mass just exterior to this muscle. 

 This "stellate ganglion" controls the movements of the 

 mantle, on the inner surface of which it lies, covered by 

 the internal epithelium of the mantle. Tn an adult 

 Eledone the ganglion is about P> mm. across, and its 

 surface is smooth. It gives off a radiating series of nerves 

 to the mantle. These nerves are all stout, and after 

 running for part of their course on the internal wall of 



