AX I N IT § ohseurus, 
TAB. CCCXlV. 
Spec. Char. Obovate, posteriorly cuneiform } 
anteriorly rounded ; surface convex, with 
one obtuse keel ; beaks large. 
Somewhat resembling the last in form, but not so wide* 
and having no angles upon the anterior end; as the 
specimens are all casts the lunette is not observable, 
but the impressions of the muscles and the edge of the 
mantle are strongly marked ; the latter is entire. 
This uncommon shell was brought to me by Mr. 
Farey, from Garforth Cliff quarry, near Leeds, where 
it was discovered by Wm, Smithson, Esq. and also 
from Selby, eight miles distant, supposed to be out of 
the Magnesian Limestone, a rock but sparingly sup- 
plied with fossil shells. The cast enclosed in the mass 
of stone (see the lowest figure,) may possibly be another 
species, but it is too imperfect to decide upon. Mr. 
Farey found it by the road-side one mile N. W. of 
Pontefract, in a stratum 6 or 8 inches thick, probably 
similar to another at Westbridge Hill ; it has part of 
the shell remaining upon it. 
