966 Marine Shells of Massachusetts. 
This species is occasionally found living in the vicin- 
ity of Boston, and worn specimens are abundant at 
Chelsea beach. The specimens in this vicinity, whether 
living or dead, are usually destitute of the bands of ru- . 
fous color, which suggested the specific name, but the 
whole surface i is often more or less tinged with it, and 
more deeply upon the granules, which are formed ny 
the strong decussation. — . 
The operculum i is horny, lamellar, Lee d and 
irregularly serrate upon the two outer margins. The 
foot, as in the B. obsolétum, is very long. 
B. lunàtum. Nassa lundta, Sax. Journ. Acad. Nat. 
V. 913. P GN 
The coloring of this ium. as Say remarks, varies 
much in different individuals. Some are of a uniform,- 
very deep brownish red, and others are of a paler shade 
of the same color. But the arrangement of colors de- 
scribed in the Journal of the Academy is a type of 
which most of the varieties are modifications. "The sub- 
lunate whitish spots are often so much. enlarged .as to . 
constitute 1 he ground color of the shell, being separated ` 
only by trow, undulate longitudinal lines of brown, 
while.the revolving stripes of brown which u usually sepa- 
rate them into two. or three series, are g. Many 
specimens are intermediate between this arrangement 
and that which Say has taken for the type of the 
species. _ 
A single specimen of a variety remarkable for the 
elongation of the spire, occurred among several 
dred others. Unfortunately it has been lost, nda 
particular description cannot be given. " ! 
: - 
S x Ry 
