216 Marine Shells of Massachusetts. 
a dredge, in Newport harbor, Rhode Island. This 
summer with a dredge I- found a number of speci- 
mens in the harbor of Dartmouth, in. mud, where the 
water exceeded the depth of four feet at low tide. The 
majority of specimens thus obtained were dead, and had 
become cretaceous, but a number of them were living, 
and were readily identified with the description of this 
species. The number of ^ transverse ribs,” (transverse 
not to the axis of the shell but to the whorls,) is seldom 
less than twenty-five, and often exceeds thirty. Above 
the body whorl, the number -of the revolving lines does 
not exceed eight. The arrangement of them in pairs 
does not distinctly appear in these specimens. There 
are three revolving bands of color ón a whitish horn 
colored ground, the upper of which is a reddish violet, 
and the others are wax colored ; but the wax colored 
bands are often confluent into each other, sometimes over 
the entire surface of the whorls. 
Length of the largest specimen, A254 in. ; breadth, 
.915. 
This species has not before been noticed i in the waters 
of this State. 
CnzPIDULA. 
Cc. plana, Say. Journ. Acad. Nat. Sc. II. 226, Amer. 
Conch. No. V. Pl. 44 
es; p * s which are found in the wa- 
ters of tl e. The on il however, is always 
If is 
-he j oung shell is not only orbicular but 
losing its seti but not nee 
