99 
EUOMPHALUS nodosus, 
TAB, XLYI. 
Spec. Char. Upper side having a nearly central 
ridge, under side a row of rather large nodular 
projections : Aperture nearly round. 
A much larger shell than the last, with the same number of 
whorls, and an aperture above one»third the diameter of the 
shell. There are about ten projections to each whorl; those 
of the inner whorls being half concealed. 
The late Mr. Martin also favoured me with this specimen 
as a Derbyshire one ; he has neither figured nor mentioned 
it further as I know of, nor is it noticed by any other author. 
It is sometimes a large shell, as, besides the specimen of 
which I have here figured the upper and under side, I have 
a fragment with four nodular projections that fits on this at 
about the fifth projection beyond the end, which would 
make it much larger, at least twice as big, and give the 
cavity a remarkable depth. The nodular or under side of 
the shell is placed uppermost in the plate because most 
characteristic. The lower figure or upper side of the shell 
much resembles that of E. .atillus, the ridge however is 
nearer the middle. The whole is Limestone, the shell 
rather thin and mostly crystallized or decomposing and 
chalky. 
