ELEDONE. ° 581 
and passing off in the vessel on its inner side, is carried 
back by a vein to the lateral vena cava (fig. 63, Br. gld. 
V.). This it enters just external to the branchial heart. 
Probably this gland is connected with the manufacture 
of the corpuscles of the blood of Hledone—and other 
Cephalopods. | 
2. Skin.—As the skin of Hledone is very plentifully 
supplied with capillaries, especially from the venous 
system (figs. 57 and 58), it is possible that: there is also a 
certain amount of cutaneous respiration. 
COEKLOM. 
All Molluses have a reduced coelom, and a corre- 
spondingly dilated haemocoel. Although this pheno- 
menon of ‘“ phleboedesis’”” has not been carried so far as 
in the Arthropoda, still (1) the coelom has ceased to be 
a true perivisceral cavity and its main remnants are the 
pericardium and the genital cavity, which still communi- 
cate with one another; and (2) large venous sinuses occur, 
forming a secondary body cavity. 
Whereas in Sepra the pericardium and genital 
cavity are both well developed, and are only separated 
from one another by an incomplete dorsal septum, in 
Hledone and other Octopoda the pericardial division is 
ereatly modified and reduced. It is represented by a pair 
of thin-walled, semi-transparent, flask-shaped pouches 
(Pl. V, fig. 40, Coel.), situated laterally, dorsal and 
posterior to the base of the ureters. Posteriorly each pouch 
contains the corresponding branchial-heart-appendage, 
or pericardial gland (fig. 40, Br. app.), while anteriorly 
it opens into the corresponding ureter, by an oval reno- 
pericardial aperture in the dorsal wall (fig. 40, 2. Pe. ap.). 
The genital division of the coelom is well developed in 
