544 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
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 apphed 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 70, Acc. 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. 
Next 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. 70, 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 
(fig. 69), and ends in several fine branches. 
B. (9) The Auditory Nerve is short and slender, 
and runs to the auditory organ or statocyst, from its 
point of origin, just above the anterior funnel nerve 
(fig. 70, Aud. N.). Each auditory nerve running 
posteriorly enters the statocyst 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 
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