546 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
most brachial nerve, at its origin, a fine nerve on each | 
side runs outwards to innervate the muscles of the head . 
(e027) co 
Visceral Nervous System. 
EKledone, like all other Cephalopods, possesses a 
visceral nervous system. There are two ganglia, one 
situated near the anterior end of the alimentary canal, 
and one near the stomach. ‘The two are united by a long 
nerve which runs down the wall of the oesophagus. Each 
of them gives off several nerves to the neighbouring parts 
of the alimentary canal. This system is connected with 
the central nervous system by means of the buccal nerve 
a Oe 
only. 
The Sub-oesophageal Ganglion represents the 
anterior centre of the visceral system (fig. 72, Oes. g.). It 
is a fairly large, bilaterally symmetrical, flattened 
ganglion, situated in the acute angle between the buccal 
mass and the oesophagus. To expose it properly, the 
anterior salivary gland must be turned forward (PI. VIII, 
fig. 72, s.g.). Looked at laterally, the ganglion is 
roughly triangular. The buccal nerves enter it at its 
posterior external angles (fig. 72, B.W.). From the 
anterior angle the ganglon gives off several nerves. Of 
these, the lowest enters the buccal mass, the next runs to 
the anterior salivary gland (fig. 72, a and 6 resp.), the 
third enters the buccal mass (fig. 72, ¢.), the uppermost 
(ig S250) mines up ‘to the oesophagus, and then 
anteriorly along its wall to the buccal mass. The 
posterior edge of the sub-oesophageal ganglion gives off 
two nerves to the oesophagus. ‘The anterior one is short 
(fig. 72, 7), but the posterior one is long and runs down 
the side of the oesophagus as far as the crop (fig. 72, g). 
Posterior to the crop the left and right nerves of this pair 
