60 
possesses sufficient characters to mark its genus, is too much injured 
and involved in pyrites, to allow its species to be determined. Its 
parallel compressed, and obliquely inclined ribs, with the pointed 
angle at their summit, and the smooth columella, completely, how- 
ever, determine its genus. This shell was found in a stratum of dark 
pyritous clay, at Brentford, on the premises of Messrs. Trimmers. 
Lamarck describes but one fossil species, II. mutica, as found near 
Paris. 
XXVI. Cassis. A gibbose ventricose univalve ; the aperture longi- 
tudinal and subdentated, and terminating in a short reflected canal. 
The columella plicated in its lower part ; and the left lip flattened, 
and forming a ridge on the body of the shell. 
Cassis carinata, Lam. ; JBuccinum nodosum, Soland. and Brander, 
is a beautiful fossil species of this genus. 
A very beautiful fossil shell is found in a hill in Arragon, at above 
a hundred feet in height. The nodulous rugae, on the left side, at 
the lower flattened part of the columella, the dentated right lip, the 
reverted sinus, and the globose cassideal form, determine its genus ; 
whilst its transverse rounded ribs, and nodular risings on the upper 
part of the body of the shell, mark its species as different from any 
recent shell with which I have been able to compare it. It is about 
two inches and a half in length. 
The hills of Tuscany also yield some fine specimens of this genus. 
One of these, about half the size of the preceding fossil, possesses 
most of its characters ; but its spire projects more, and is formed of six 
turns ; and the mouth contracts, in its upper part, into a sinus, be- 
tween the body of the shell and the right lip. The surface of this shell 
is smooth. A second of these Tuscan cassidites is still longer in its 
spire, which is formed of seven turns, and is characterized by regular 
transverse circular markings. In a third, the surface is marked by 
lines similarly disposed, but alternately larger and smaller ; and the 
teeth of the right lip are very prominent and distinct. The general 
