70 



In the neighbourhood of Paris only, this assiduous investigator has 

 discovered sixty species of this genus. 



C. interruptum, C. he.ragonum, C. serratum, C. tricarinatum, C. vittatum, 

 C. clavatulatum, C. echidnoides, C. angulosum, C. cristatum, C. calcitrapoides, 

 C. denticulatum, C. umbrellatum, C. lamellosum, C. thiara, C. mutabilc, 

 C. semicoronatum, C. cinctum, C. plicatum, C. conoideum, C. confluens, 

 C. clavusy C. baccillum, C. scabrum, C. asperellum, C. turritdlatum, C. mitra, 

 C. pleurotomoides, C. involutum, C. tubercnlosum, C. bicarinatum, C. trochleare, 

 C. trochiforme, C. muricoides, C. purpura, C. conoidale, C. subulatum, C. la- 

 pidorum, C. petricolum, C. spiratum, C. columnare, C. substriatum, C. qua- 

 drisulcatum, C. umbilicatum, C. perforatum, C. clavosum, C. cancellation, 

 C. semigranosum, C. acicula, C. terebrale, C. inversum, C. melanoide, C. larva, 

 C. gracile, C. incertum, C. emarginatum, C. rugosum, C. giganteum, C. nu- 

 dum, C. unisulcatum, and C. turritdlatum. 



Observing on the numerous species of this fossil, M. Lamarck says, 

 we may with reason be exceedingly astonished at seeing so many spe- 

 cies of one genus, almost all of which are unknown to the naturalist, and 

 by far the greater part found in one spot ; and adds, that we are hence 

 authorized, in some degree, in believing that the remains of fossil shells, 

 which are found inland, are there more abundant than the shell-fish 

 which now inhabit our seas. Annales du Museum, &'c. Tome in. p. 441. 



The specimen of C. spiratum, Plate VI. Fig. 6, 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. Striae 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. 

 The notch in the lip is also seen nearly contiguous to the last turn 



