Helicolimax Lamarckii. 307 
which are flat, and but little divided, clothe the upper portion completely, 
so as to divide the lower portion by an accurately defined line. When the 
mass of the mouth is drawn inwards to the fullest extent, the upper 
portion of the stomach is greatly contracted, and enters into the lower 
by a sort of introsusception, much in the same manner as the proboscis 
of Buccinum undatum is retracted. In this state it is represented at 
fig. 2& 3. But when the mass is not so strongly retracted, the upper 
portion becomes in proportion more extended, and only a small -part is 
then inclosed within the lower part of the stomach. Whether or no the 
whole of the upper portion is drawn out when the animal is in its full 
state of extension, as for instance, when it feeds, or whether the intro- 
susception takes place only when it contracts itself, to take refuge within 
its shell, either wholly, or partially under the large expanse of the 
corselet, I am unable to decide, not having a sufficient number of speci- 
mens to examine this point under different circumstances. I have not, 
however, seen any case in which it did not exist in a slight degree, as 
in fig. 4. When it takes place, it is at the expence of the upper portion 
of the stomach, the line defined by the termination of the salivary glands 
being that from which it commences. 
There is no marked distinction between the lower portion of the 
stomach and the duodenum ; but the latter is simply a continuation of the 
former, gradually diminishing in diameter; the intestine suddenly chang- 
ing its course and running back again for a short distance, almost parallel 
with the stomach as in Helix, though with no indication of a cecum ; and 
after two turns, one above, and another below, passing along the outer 
edge of the pulmonary cavity. It is nearly even throughout. The coats 
are not furnished with any remarkable ribs or wrinkles, but that of the 
upper portion is slightly thicker than the rest. 
I was not able to trace accurately the lobes of the liver, except the 
large one, which in conjunction with the ovary fills the spire, and is 
precisely as in Helix, and so as far as I can judge are the others; I 
conceive they pour in the bile at the commencement of the duodenum, 
but I could not demonstrate this point. 
The organs of generation have their orifice behind the right larger 
tentaculum, and both are united in the same animal. From the ovarium 
the oviduct is given off, which after curling more or less from right to 
