76 



the mantle enter its substance, and divide up into smaller 

 branches, which end there, forming a network of nerves 

 throughout this organ. There are about fourteen of these 

 large branches, and also several short nerves which run 

 directly inwards into the mantle substance from that 

 surface of the stellate ganglion which is applied thereto. 

 The two longest radiating branches run down towards the 

 base of the gill, and innervate the posterior part of the 

 mantle (fig. 69). Internal to these longer nerves are 

 two shorter ones which run below the lateral muscle, and 

 then enter the mantle. 



B. (7) The Accessory Pallial is a rather more 

 slender nerve, given off just dorsal to the pallial (figs. 69 

 and TO, Ace. Pall. N.). It pierces the cranial wall 

 dorsal to the pallial nerve, and runs alongside this for a 

 short time, on the inner surface of the visceral envelope. 

 Xext it runs inwards and becomes embedded in the 

 muscles of the head. Here its fibres may be traced to the 

 lateral wall of the funnel and also to the great lateral 

 muscle. 



B. (8) The Nerve of the Anterior Vena Cava 

 arises just exterior to and behind the anterior funnel 

 nerve (fig. TO, Ant.V.N.). It is a fine nerve which, 

 after piercing the ventral wall of the cranial capsule, 

 curves ventrally round the wall of the anterior vena cava 

 (tin-. 69), and cuds in several fine branches. 



B. (9) The Auditory Nerve is short and slender, 

 and runs to the auditory organ or statoeyst, from its 

 point of origin, just above the anterior funnel nerve 

 (fig. TO, Aud. N.). Each auditory nerve running 

 posteriorly enters the statoeyst at its interior and dorsal 

 angle, and then runs to the membranous vesicle, ending 

 in two branches, one to the sensory pad and the other to 

 the sensory ridge in that organ. In reality the fibres of 



