A. EF. Verrill— Mollusca of the New England Coast. 175 
suture. Aperture rather broad-ovate, narrowing gradually to the 
canal, without any marked constriction. Canal short, rather broad, 
wide at base, narrowing toward the tip. Columella nearly straight, 
slightly sigmoid toward the tip. Operculum small, pear-shaped, 
narrowed anteriorly, with the inner edge slightly incurved, and with 
a minute notch close to the tip, just behind the minute subspiral 
nucleus, which is situated just within the margin, much as in the 
preceding species and S. parvus. Epidermis thin, occasionally rising 
into minute scales and points along the lines of growth, especially 
near the suture. Color, in alcohol, dull pinkish white. Nuclear 
whorls pale brownish. 
Length of one of the largest specimens, 14°"; breadth, 7°5"™; 
length of body-whorl and canal, 10"; length of aperture, 8™"; its 
breadth, 3°5"™. 
Station 2115, N. lat. 35° 49’ 30", W. long. 74° 34’ 45", in 843 
fathoms, three living specimens (No. 35,573); and station 2055, 
N. lat. 42’ 32”, W. long. 68° 17’, in 99°5 fathoms, one dead specimen. 
This species has some resemblance to Mohnia Mohnii Friele, for a 
specimen of which I am indebted’ to the kindness of Mr. Friele. 
The latter is a less delicate shell, with coarser spiral lines, and with | 
much larger nuclear whorls, and the operculum is much more dis- 
tinetly spiral, its nucleus being larger and farther from the edge. 
S. concinnus (Fusus concinnus Jeff.), is also similar to our species 
in form and size. 
Sipho leptaleus Verrill, sp. nov. 
PLATE XX XI, FIGURE 14. 
Shell small, fusiform, glossy white, with five whorls, which are 
very convex, slightly carinated and angulated in the middle, on the 
lower whorls. Suture well impressed. Spire elevated, regularly 
tapered, acute. The sculpture consists of numerous regular, thin, 
delicate, raised, longitudinal ribs, which are bent in a sigmoid curve, 
the part corresponding to the most prominent angle of the whorls 
strongly receding ; and of fine, microscopic, wavy revolving lines 
between the ribs. There is usually a distinct internal line, just 
below the suture. Aperture irregularly ovate, rather narrow, elon- 
gated. Outer lip thin, rounded to the base of the canal, which is 
somewhat lengthened, oblique, and a little twisted. The columella- 
margin of the canal forms a sigmoid curve. Nucleus prominent, 
rounded, consisting of about one whorl and a half, covered with fine 
spiral lines, 
