KLEDONE. 515 
ganglion, but internal to the neurilemma of this ganglion, 
ie., between the neurilemma and_ the ganglionic 
substance, and then divides into three branches. One of 
these supplies the anterior salivary gland (Pl. VI, fig. 50, 
S.A.), the anterior branch supplies the anterior lateral 
wall of the buccal mass, and a third branch runs 
ventrally, to supply the ventral posterior portion of the 
buceal mass (fig. 50, B,A,, B8.A.). Small arteries 
accompany several of the nerves given off by the sub- 
oesophageal ganglion. Anterior to the salivary and 
pharyngeal arteries a second branch is given off which 
divides into several arteries :—(1) an artery giving off a 
branch to the funnel (fig. 42, /. A.), and then running 
down on the inner side of the visceral envelope, to end 
there by splitting up into many smaller branches (fig. 42, 
V..A.); (2) a branch which follows the course of the 
accessory pallial nerve, and so supplies the muscles of the 
head, and the lateral chamber of the funnel; (3) a branch 
to the eye (fig. 42, O. A.); and (4) a short branch running 
inwards to the statocyst. The next branch given off by 
these forks is a second artery to the eye (fig. 42, O. A.). 
A second very fine branch to the anterior part of the 
funnel is the last branch given off by the two forks of this 
aorta (fig. 42, /’, A,). 
The Abdominal Aorta is much more slender and less 
important than the anterior aorta. It arises anteriorly 
from the ventral wall of the left chamber of the heart, 
and runs forwards and ventrally. Soon after its origin it 
gives off a left and right branchial artery. Hach of these 
runs transversely across to the corresponding gill, just 
dorsal to the kidney sac, and ventral to the auricles 
(fig. 42, Bl. A.). Further along, the abdominal aorta 
gives off the artery of the ink sac, which runs inwards 
and forwards to the base of that organ, giving off two 
