58 
This shell, he says, is so singular, that I hesitated in determining its 
genus. It has the prominences of a murex, the folds of a volute, 
and the general appearance, with the notch, of a buccinum ; and yet, 
its other characters and agreements, determine its place to be among 
the cancellariae. He describes two species of this genus as fossils : 
C. costulata and C. volutella. 
XIX. Nassa. An oval univalve, the opening terminating inferiorly 
with an oblique notch, a little channeled ; the base of the columella 
hiding the notch, in part, and appearing to be obliquely truncated. 
It does not appear that any fossil shells of this genus are known. 
XX. Purpura. An ovate univalve, its surface being rather rough 
with spines or tubercles ; the a'perturc notched, and slightly channeled 
in the lower part ; the columella naked, flat, depressed, and termi- 
nating in a point at the base. 
Purpura lapillus, Buccinum lapillus of Linnceus, is the only species 
found fossil by Lamarck. 
XXI. Buccinum. An ovate elongated univalve ; opening oblong, 
notched in the lower part, and with no canal ; columella convex, full 
and naked. 
Bruguiere reduced the Linnaean genus Buccinum, by taking from 
it the genera terebra and cassis. Lamarck has carried this reduction 
still further, by forming, with some of the shells, the genera tonna, 
harpa, nassa, &c. Those shells only are now disposed by Lamarck, 
under the genus Buccinum, as possess the above characters. 
Buccinum Stromboides, Lam. from Grignon, is distinguishable by 
its full slightly ribbed lip, which forms somewhat of a stromboidal 
sinus at its attachment to the spire. This shell in general possesses 
a considerable polish : and, as in this specimen, Plate V. Fig. 20, it 
frequently shows some of its original colour. It appears that six 
species have been found in the environs of Paris : B. stromboides, 
B. striatulum, B. terehrale, B. decussatum, B. bistriatum, and B. 
clavatulatum. 
