40 
AMPULLARIA helicoides. 
TAB DXXll.—jig. 2. 
Spec. Char. Almost discoid^ smooth ; spire very 
shorty blunt ; whorls nearly blended,, round ; 
base umbilicated ; aperture oblong*. 
A peculiarly obtuse-looking shell, whose diameter is 
nearly double its length ; the whorls are convex, but the 
sutures between them are not sharply defined ; the um- 
bilicus is of a moderate size ; the aperture is longitudi- 
nal as in the last, it approaches much towards circular, 
with an indentation in its upper half made by the pre- 
ceding whorl. Some individuals have an obscure band 
round the outer whorl. 
Not very unfrequent in the black foetid limestone of 
Ireland. The oval specimen, fig. 3 . is, I believe, from 
near Cork ; the other from Queen’s County. 
These two species are referred to the genus Ampulla- 
ria, until another generic name is proposed under which 
to arrange them, along with such other fossil shells as 
we have recommended should be separated from that 
genus, to which Mons. Lamarck had with some hesita- 
tion referred them, and which do not belong to the 
neighbouring genus Natica. See vol. 4, p. 97. 
