Anatomy of Cerithium Telescopium. 435 



continuation of that in the second sac. The valve of tlie 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 branchi?e 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 MoUusca, 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 oesophagus, 

 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 

 Vol,. V. FF 2 



