A. FE. Verrili—Mollusea of the New England Coast. 181 
few revolving lines appear; the lower whorls are crossed by about 
fourteen to sixteen, regular, rather elevated, but not broad, rounded 
ribs, which are nearly straight and separated by pretty regular inter- 
spaces, usually about twice as broad as the ribs. On all except the 
last whorl, the ribs extend from suture to suture; on the last whorl 
they fade out a little below the periphery. The whole shell, except 
the nucleus, is covered with well developed, rather thin, revolving 
cinguli, which are about the same height as the ribs, though rather 
thinner, but in crossing the ribs they do not form nodules, so that 
the surface is cancellated with a regular net-work, of which the 
meshes are squarish, or elongated in the direction of the revolving 
lines, but below the periphery of the last whorl the cinguli become 
stronger and the ribs fainter, while the greater part of the base is 
occupied with cinguli only, which are here rather closely crowded. 
On the penultimate whorl there are about six or seven cinguli; on 
the body-whorl there are sixteen to nineteen, of which eight or nine 
are posterior to the lip, and six or seven anterior to it. The surface 
is also marked with very fine revolving striz, visible under the 
microscope. Umbilicus none. Aperture rounded or very broadly 
ovate, usually slightly narrowed and obtusely angled posteriorly ; 
broadly rounded and slightly flaring in front; outer lip sometimes 
thin and sharp, sometimes distinctly thickened, but without a varix ; 
anteriorly it is slightly effuse, and sometimes forms there a faint 
rounded angle; the inner lip is continuous, forming a regular curve, 
but not quite so convex as the outer margin; the portion in contact 
with the body-whorl has a free edge, and in the umbilical region the 
margin is a little reflexed, often leaving a slight furrow beneath it. 
Length, 3™™; breadth, 1°6™™; length of aperture, 1:27"; its 
breadth, -8™". Other specimens are somewhat more slender than 
the one measured. 
Station 2109, in 142 fathoms, off Cape Hatteras, N. lat. 35° 14’ 20", 
W. long. 74° 59’ 10". Several specimens, living and dead (No. 
35,453). 
This species belongs to the same group as C. arenaria, C. carinata, 
and C. areolata of our northern coasts. From all these it differs in 
having a finer and more regular sculpture, both the ribs and revolv- 
ing lines being much more numerous and more regular. Nor do 
either of the northern species possess the microscopic striz. In this 
last character it resembles C. harpa and C. leptaulea; but C. harpa 
is a stouter shell, with much finer and more numerous revolving 
lines, which do not give it a cancellated appearance. C. leptalea is 
