1834.] Zoblogy. 637 
passage by means of which the fluid which passes into the peri- 
cardium from the blood can make its way into the kidneys. 
There are no indications of a water-vascular system in either 
Gasteropods or Lamellibranchs. In pursuing his investigations 
the author found great assistance from the air-pump, the use of 
which he learned at the Naples station. The thickest and largest 
pieces of the feet, which would otherwise have required several 
day’s treatment, were rendered easy of section after a few hours. 
—Fournal of the Royal Microscopical Society. 
SUCKERS oF CePHALoPops.—P. Girod describes the suckers of 
, Octopus vulgaris and Sepia officinalis, which are at first to be dis- 
tinguished from one another by their sessile condition in the 
= former and their pedunculated character in the latter; in the 
capod there is, further, a horny ring developed, but there is 
‘Not, asin the Octopod, any elastic cup or construction, the cavity 
of the sucker forming asingle chamber. 
In the Octopod the suckers act thus: The animal contracts the 
extrinsic infundibular muscles, the sphincter of the orifice, and 
the inferior muscular envelope, and the form of the sucker be- 
Then the infundibulum or upper portion 
of the sucker becomes conical, the acetabular chamber enlarges, 
8 
s 
H 
3 
D 
O 
x 
< 
2 
D 
z 
p 
a 
d 
pes 
wn 
© 
ma 
peg] 
(a) 
oO 
Q. 
= 
oO 
wn 
w 
rr 
eie] 
-y 
ps 
< 
D 
e 
fst) 
O 
c 
c 
3 
i 
re 
n g 
S 
w 
zk 
3 
oO 
A 
fs] 
3 
oO 
f$] 
3 
w 
of the sucker, and so to increase the vacuum. In the Deca- 
pod there is a piston-like arrangement which becomes withdrawn 
mig be more completely displayed when he gives an account of 
mi : 
RESEARCHES ON THE Isopopa.—L. Huet, among the important 
additions which he has made to our knowledge of these Crustacea, 
Rae, n able to prove the existence of large salivary glands, and 
t not only in the terrestrial, but also in the groups that are es- 
stially marine, such as the Idoteide and the Cymothoide. 
Sith discovery is of especial importance when we remember that, 
the hy the whole group the results which he has found true for 
a 
With regard to the processes of respiration, the author made a 
> though: a €xperiments which resulted in showing him that, 
i gh there is a very close resemblance in the characters of the 
can, by which they are effected, there are but few found that 
Mont danger, exchange a terrestrial for an aquatic mode 
