A. E. Verrili— Mollusca of the New England Coast. 199 
Cyclostrema affine Verrill, sp. nov. 
PLATE XXXII, FIGURE 15. 
Shell rather large for the genus, with a moderately elevated spire, 
a prominent, convex base, a narrow umbilical perforation surrounded 
by spiral lines, and evenly rounded, nearly smooth whorls, separated 
by a distinctly impressed suture. 
The nuclear whorl is moderately large, smooth, chestnut-brown, 
rounded, slightly prominent, and a little incurved. The succeeding 
whorls are evenly rounded, increasing rapidly, with a smooth and 
somewhat glossy surface, and marked by faint lines of growth, and 
occasionally with a few indistinct spiral lines below the suture, and 
by numerous thin, raised, and well defined cinguli on the base; the 
innermost of these, immediately around the umbilicus, are stoutest 
and most elevated, the size and elevation decreasing outwardly until 
they disappear, usually about midway between the umbilicus and the 
periphery ; the inner ones are separated by intervals mostly about 
equal to twice their breadth; the outermost ones are relatively 
farther apart, while the intermediate ones are usually nearest 
together ; sometimes one or two of those revolving within the um- 
bilical depression are decidedly larger than any of the others, taking 
the appearance of small carine, but the outer ones are always fine 
and thread-like. The aperture is somewhat oblique, large and nearly 
round, but slightly flattened or indented opposite the body-whorl and 
umbilicus; the lip is thin and the inner portion is attached to the 
body-whorl for only a very short distance, and shows a distinct, free 
edge. The umbilicus is narrow, spirally twisted and often partially 
concealed by the margin of the inner lip. Color grayish white, 
often a little iridescent and somewhat lustrous. Operculum yel- 
lowish horn-color. 
Length, 2™™; breadth, 2:2"; breadth of aperture, 1:37". 
Station 2115, N. lat. 35° 49’ 30", W. long. 74° 34' 45”, in 843 
fathoms, five living specimens. 
This is closely allied to C. basistriatwm J., and C. rugulosum 
Friele, of the European coasts. 
Cyclostrema diaphanum Verrill, sp. nov. 
PLATE XXXII, FIGURE 16. 
Shell small, depressed, trochiform, thin, translucent, white, with a 
smooth shining surface, without sculpture except around the small 
umbilicus, where there are numerous fine, close, spiral lines, 
