7o 
C. clavatulatum , C. echidnoides, C. cingulosum, G. cristatum, C. calcitra- 
poides, C. denticulatum, C. umbrellatum , C. lamellosum, C. thiara, C. mu- 
tabile, C. semicoronatum, C. cinctum, C. plicatum, C. conoideum, C. Con- 
fluens, C. claims, C. baccillum. C. scabrum, G. asperellum, G. turritellatum , 
G. mitra , C. pleurotomoides, C. involutum, C. tuberculosum, C. bicarinatum , 
C. trochleare, C. trochiforme, C. muricoides, G. purpura, G. conoidale, C. 
subulatum , C. lapidorum , C. petricolum, C. spiratum, C. columnare, C. sub- 
striatum, C. quadrisulcatum, C. umbilicatum, C. perforatum, C. clavosum, 
G. cancellatum, C. semigranosum, C. acicula , C. terebrale, C. inversum, C. 
melanoide, G. larva , G. gracile, C. incertum, C. emarginatum, C. rugosum , 
C. giganteum, C. nudum, C. unisulcatum, and C. turritellatum. 
Observing on the numerous species of this fossil, M. Lamarck says, 
we may with reason be exceedingly astonished at seeing so many 
species of one genus, almost all of which are unknown to the natu- 
ralist, and by far the greater part found in one spot ; and adds, that 
we are hence authorized, in some degree, in believing that the re- 
mains of fossil shells, which are found inland, are there more abun- 
dant than the shell-fish which now inhabit our seas. Annales du 
Museum, Sfc. Tome hi. p. 441. 
The specimen of C. spiratum, Plate VI. Fig. 0, is particularly inte- 
resting, from its substance being completely calcedonic. At first view 
it might be supposed to be merely a cast ; but this is not the case ; the 
whole substance of the shell being now a very transparent calcedony, 
displaying distinctly the minutest characters of the species. A row of 
large tubercles, placed over the middle of each winding, renders the 
spire knobbed, and almost spinous. Strife are seen crossing each 
other, over the whole surface ; the transverse striae being larger than 
the others, and rather tuberculated, having the appearance of minute 
chains. Three of these, distinct and separate, are plainly visible on the 
last turn. A notch in the lip is also seen nearly contiguous to the last 
turn but one. This notch appears, however, to be accidental. This 
curious fossil I extricated from a calcedonic mass from France. 
