39 
AMPULLARIA nobilis. 
TAB DXXII. —Jig. 1. 
Spec. Char. Subglobose„ smooth ; spire conical, 
composed of a few convex whorls ; base very 
convex,, not umbilicate ; aperture elliptical^ 
sublunate^ pointed above. 
A magnificent although a simple formed fossil : there 
is a boldness in its contour that renders it handsome, 
and at the same time gives it a character very different 
from fossils in general. The shell does not appear to 
have been thick : it was externally slightly waved in the 
direction of the lines of growth ; the spire is pointed, 
composed of about five whorls, and occupying one third 
the length of the shell : the aperture appears to be per- 
fectly longitudinal, and equals half the entire length. 
One of the products of that only recently explored 
mine of fossil shells, the Black Rock of Queen’s County 
in Ireland. The substance of the shell is partly con« 
verted into calcareous spar, but principally almost in- 
corporated with the black limestone. 
