COMPARED WITH THAT OF NAUTILUS POM PI LI US. 
285 
q. The intestine, forming two principal flexuies. 
r. Branchiae. 
s. Nidamental gland. 
t. Anterior wall of pericardium, laid open to expose the contained 
organs. 
t'. Posterior wall of ditto. 
u. k!. Anterior and posterior renal follicles separated by an indupli- 
cation of the anterior wall of the pericardium. This fold also 
extends between the anterior and posterior branchial vessels of 
the corresponding side which pour their blood into 
V. The ventricle of the heart. The elongated posterior part of this 
organ extends into the abdominal cavity, through an opening in 
the posterior wall of the pericardium, and passing beneath the 
oviduct, gives rise to the principal arterial trunk, which con- 
tinues its course beneath the rectum and the middle portion of 
the liver, around which it turns, giving off numerous branches 
to the neighbouring parts, as represented in the figure. It next 
ascends between the left principal division of the liver and the 
cross, and coursing obliquely along the left side of the oeosopha- 
gus, it ultimately reaches the posterior part of that tube, to 
which it gives one or two vessels, and terminates immediately 
beneath the supra-oesophageal ganglia in fine branches, chiefly 
supplied to the buccal mass. In this course it gives off nume- 
rous lateral vessels of small size to the roof and sides of the 
cavity in which it lies, and a more important branch winds 
round the glandular bodies p, and is distributed to the border 
of the mantle. 
When the posterior conical portion of the ventricle of the 
heart appears beneath the rectum, a small duplicature of the in- 
vesting membrane is seen connecting these parts ; this fold, I 
believe, includes one extremity of the “ elongated pyriform sac,” 
first noticed by Professor OVen as arising near the base of the 
aorta and ending in the venous sinus. 
w. Ovarium, laid open on the right side, to expose, x, the calyces, of 
various sizes, attached along its roof. 
The corrugations of the lining membrane of the calyces are 
proportionately large or small, bearing relation to the size of 
these bodies. 
The ovary in this case was distended with a plastic albumi- 
nous fluid of a rich amber colour, and a considerable quantity 
of it found its way into the cavity of the abdomen, through a 
2 Q 2 
