224 
aperture is longitudinal, it is broadest at the front; the 
shell is moderately thick. 
Not very unfrequent in the black limestone of Queen’s 
County Ireland (fig. 1.), and Preston in Lancashire (fig. 2. 
& 3.) From the latter place we have been presented with 
several specimens by William Gilbertson, Esq. 
PILEOPSIS tubifer. 
TAB. DCVII.—/ig. 4. 
Spec. Cuar. Front surmounted by three rows of 
long tubes. 
Mvcu like the last but rather taller, the three rows of 
tubes are placed upon obscure ridges that run up the 
front, they equal the diameter of the aperture in length. 
The specimen figured is in the rich cabinet of W. Gil- 
bertson, Esq. We have seen only one other, which is 
smaller, but exhibits the bases of the three rows of spines 
very neatly: it is in the possession of Dr. Alexander 
Moore of Preston, from which place both individuals 
come. 
