* 
P. 
á 
272 Marine Shells of Massachusetts. 
with a deep dull reddish or brownish purple. At the 
upper part of the labrum and within the aperture, is a 
narrow, acute white fold, sub-oblique, the outer extremity 
of which spreads into a white callus. In the common 
variety of P. carica, there is at this place a very obtuse 
prominence, of uniform color with the other parts of the 
fauces. This specimen is rather immature. In length 
it is five and a half inches, and in breadth less than three. 
Is this shell a distinct species ? 
~ The operculum of the P. cárica is much like that of 
the P. canaliculata.. A specimen of this shell, of a 
common size, is seven and one-third by four and one- 
third inches. 
Fvsvs. 
F. cinéreus, Say. Journ. Ac. Nat. Sc. II, 236. 
This shell, as déscribed by Say, is usually reddish 
brown beneath a cinéreous epidermis, which is eroded 
on the ribs, and the aperture within is of a deep choco- 
late color. But not unfrequently the fauces are white, 
or white with a very slight tinge of the chocolate color 
inclining to red, or yellowish brown near the margin, 
and deep chocolate more interiorly. A specimen in my 
cabinet | has two bands of ‘purplish red upon the fauces, 
and the upper and lower parts -of the columella are of 
the same color. ‘The tra  coste are often nearly 
obsolete. . The longitudinal + ; sometimes swell into 
E dations ; or they are wanting upon a portion of the 
urface. ey are usually “ten or twelve in number. 
Length 1,25 inch. ; P 60 of an inch. 
