6 
a granular Limestone, similar to that in which it was found, 
and which is quarried there for paving, building, &c. The 
perpendicular inner margin of the whorls is three-eighths of 
an inch on the biggest part; thus the umbilicus is deep, 
although commencing rather suddenly at the fourth whorl, 
the bottom is consequently nearly flat, composed of four or 
five whorls, and very perfect, to the minutest. I was glad 
to discover the proper place for the siphuncle, expressed on 
the upper edge, by breaking the shell in looking for the 
contour of the chambers. 
This somewhat resembles Amaltheus margaritatus of De 
Montfort, t. 23, p. 91. The place of the siphuncle is of 
much consequence in distinguishing them, as his is in the 
middle of the inner margin. | 
