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LETTER VII. 
FOSSIL SHELLS CONTINUED. CERITHIUM TROCHUS... .SOLARIUM 
TURBO.... MONODONTA....DELPHINULA....CYCLOSTOMA....SCALARIA 
TURRITELLA.... PUPA.... JANTHINA.... BULLA BULIMUS ACHATINA 
....PHASIANELLA... LYMNA2 A.... PYRAMIDELLA... MELANIA... AURICULA 
VOLVARIA....AMPULLAR1A PLANORBIS... .HELIX HELICINA 
NERITA NATICA TESTACELLA STOMATIA CARINARIA 
HALIOTIS SIGARETUS ARGONAUTA. 
XXXV. Cerithium. A turreted univalve, with an oblique 
opening; the base terminated by a short truncated or recurved 
channel, and ending upwards in a channel more or less distinct. 
This genus, so plainly marked by the oblique opening, with, as it 
were, a reversed groove in its superior part, was formed by Bruguiere 
from shells possessing these generic characters, and which had been 
retained by Linnaeus in the genera Murex, Strombus, and Trochus. 
It is well observed by Lamarck, that, since the extreme diversity 
of the protuberant parts on the surface of these shells, as well as the 
regularity and elegance in which they are disposed, leaves hardly any 
possible form of which nature does not here shew a pattern, one may 
be permitted to say that architecture might receive from the species 
of this, and indeed of the preceding genus, a choice of models which 
might be well worthy of being employed for the embellishment of 
columns, &c. 
In the neighbourhood of Paris only, this assiduous investigator has 
discovered sixty species of this genus. 
G. interruptum, C. hexagonum , C. serratum , C. tricarinatum. C. vittatum. 
