174 A. E. Verrill—Mollusca of the New England Coast. 
long. 66° 00' 50”, in 906 fathoms, one hundred and twenty-five speci- 
mens, seventy-five living; station 2077, N. lat. 41° 49’ 40”, W. long. 
66° 02’, in 1255 fathoms, fifty-five specimens, twenty-five living ; and 
station 2084, N. lat. 40° 16’ 50’, W. long. 67° 05’ 15”, in 1290 
fathoms, one hundred and fifty specimens, seventy-five living. 
This species might readily be mistaken for S. ccelatus V., but the 
latter has a shorter, less acute and more abruptly tapered spire, a 
shallower suture, and the transverse ribs are prominent even on the 
whorls next to the nucleus. The sculpture, however, on the lower 
whorls agrees very closely. The operculum differs in form and 
structure. S. glyptus has the spire longer and more acute, with the 
nucleus more prominent and different in form. Its spiral sculpture 
is more highly developed and quite distinct in appearance from that 
of the present species. Although this species is referred to the sub- 
genus Mohnia, on account of the subspiral structure of the opercu- 
lum, this feature is less marked than in Mohnia Mohnii, the type of 
the group, as established by Friele, in this respect agreeing nearly 
with Sipho (Mohnia) parvus V. and 8. In fact, im respect to the 
operculum, it is somewhat intermediate between typical Sipho and 
Mohnia. 
Sipho (Mohnia) simplex Verrill, sp. nov. 
Shell small, short-fusiform, thin, delicate, somewhat translucent, 
with evenly convex whorls, and with numerous fine spiral lines and 
raised lines of growth, but without ribs. Canal short, nearly 
straight. Spire rather short, regularly tapered, acute. Whorls five 
or six, evenly rounded, rather convex. Suture well impressed, sim- 
ple. The nucleus is very small, smooth, with the apical whorl mi- 
nute, regularly spiral and largely concealed by the next whorl. Faint 
spiral lines commence on the second whorl. On the first whorl be- 
low the nucleus there are four or five thin, sharp cinguli; on the 
next these increase to ten or twelve, which are nearly equal, mod- 
erately raised, and separated by interspaces of about their own 
width; on the body-whorl the cinguli become very numerous and 
very regular, covering the whole surface to the base of the canal, but 
some of those around the periphery are somewhat thicker than the 
rest, with the summit somewhat obtuse or flattened; alternating 
with these are others of smaller size and thinner. The whole sur- 
face, both of the cinguli and interspaces, is crossed by very nume- 
rous, close, thin, raised, lamelliform lines of growth, which recede 
on the more convex part of the whorl, but bend forward toward the 
