Anatomy of Cerithium Telescopium. 435 
continuation of that in the second sac. The valve of the pylorus is very 
imperfect. 
From thence leads the duodenum, marked for a short distance with a 
continuation of the last mentioned projection, and then for its whole 
length with strong oblique lines: it follows the direction of the spiral till 
it reaches the heart, when it turns round and runs parallel with its former 
course, passing at length between the branchie and matrix till it ends 
near the margin of the mantle. The latter portion, which constitutes the 
rectum, is much and frequently constricted almost to the extremity. 
The liver occupies the whole of the upper volutions. The structure 
of it is quite different from that of other Mollusca, as far as we can 
discover; and indeed from any represented in Miiller’s Anatomy of 
Glands. It resembles more the common structure of kidneys. _ In order 
to make this plainer it will be better to trace the course backward from 
the stomach. The bile is poured in at an orifice between the small 
crest-like process described above as close to the orifice of the esophagus, 
and the large crest which divides the first sac into two. The biliary duct 
follows the course of the volutions and at short intervals communicates 
with small cysts perforated with the orifices of innumerable tubes radiating 
from a thin pale substance interposed between them and the external 
glandular portion of the liver. The glandular portion is pale olive, the 
intermediate substance white, and the tubes yellow brown, A vertical 
section of the liver presents a very interesting object. 
Both the animals examined possessed a matrix, oviduct and ovaries. 
With regard to the male organs of generation we are possessed of no 
information. The ovaries are situated immediately above the duodenum. 
Aslender thread proceeding from these by a straight course to a matrix, and 
entering it somewhat obliquely, is the oviduct. The matrix is very large 
and complicated, close to, and parallel with the rectum. It consists of 
three strong folds which fit over a thick longitudinal wrinkled rib so closely 
that it appears like a simple sac and requires a minute inspection to 
ascertain the real structure, Between this and the first fold are numerous 
little transverse indentations which appear externally like striae. These 
doubtless form so many little bags for the reception of the eggs, Between 
Von. V. FF 2 
