436 Rev. M. J. Berkeley and Mr. Hoffman 
the first and second fold are a number of wrinkles... The matrix 
terminates close to the anus. 
Besides the organs above mentioned, there is a cylindrical body 
consisting of a rather firm transparent jelly, disposed apparently in 
layers, parallel to the rectum, and running along the duodenum as far as 
the pylorus. Of this no excretory tube could be satisfactorily traced, 
but it was supposed that it must secrete something necessary for the eggs. 
The brain consists of four ganglions. The two upper ganglions are 
close together, as also are the two lower ones. The right upper ganglion 
sends off on its own side two principal nerves beneath the cesophagus, 
and one above it to the left. The left upper ganglion sends off two 
behind; and in front both send off to the parts about the mouth several 
nerves, of which the hindermost are forked at their origin from the 
ganglions. The two lower ganglions supply the tentacula, and from 
their lower part numerous branches penetrate the foot. 
From the whole of the preceding account it is evident that we have 
before us an animal allied very nearly indeed to Trochus, Its external 
appearance is precisely that of Turritel/a, with the exception that in 
Turritella there is a membrane on the right side of the foot. The 
digestive organs are very like those of the Trochus dissected by Cuvier. 
The stomach would indicate that its food is either vegetable, or if animal, 
from its complicated structure, and the thickness of its coat in parts, 
something most probably of a crustaceous nature ; and the very small 
powers of the mouth, ill fitted for constant gnawing, make it highly 
probable that its habits may be exactly those of Adanson’s species. 
However this may be, there can be little doubt that they are most nearly 
allied. The small Cerithiwm reticulatum of our coasts in external 
structure is just the same, possessing appendages neither to the foot nor 
mouth, 
