PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 367 
1s rather coarse, the ribs being strong, with wider and concave intervals; 
the whorls are strongly angularly shouldered, each of the ribs ending in 
a distinct nodule, formed by the first spiral groove below the shoulder, 
which is stronger than the rest; the flattened subsutural area is nearly 
_ or quite destitute of spiral lines, but is crossed by slight flexuous exten- 
sions of the ribs; the whole surface below the shoulder is covered with 
strong spiral lines, between the ribs. On the upper whorls a few of the 
revolving lines are stronger than the rest, forming with the ribs a 
coarsely cancellated structure. 
The dentition is very characteristic, and entirely different from B. 
exarata, B. harpularia, and other allied forms. The uncini are broad, 
flat, lanceolate, with a sharp, slightly barbed tip, and with a broad 
bilobed base. 
This species has frequently been dredged by us in Massachusetts Bay, 
Bay of Fundy, &c., in 5 to 50 fathoms. 
Bela simplex (Middend.). 
G. O. Sars, Moll. Reg. Arct. Norv., p. 239, pl. 17, fig. 4; pl. 23, fig. 11; pl. ix, 
fig. 9 (dentition). 
Bela levigata Dall (teste G. O. Sars). 
One dead, but fresh, small specimen, from station 894. The whorls 
are very convex and evenly rounded, nearly smooth, but covered with 
fine and close spiral lines, crossed by still finer lines of growth; sub- 
sutural zone smooth. The apex of the spire is acute. The three apical 
whorls are chestnut-brown; their surface is finely decussated by equal 
lines running in opposite directions. 
Bela hebes Verrill, sp. nov. 
Shell short-fusiform or subovate, with a short, blunt spire and five 
well-rounded, slightly turreted whorls: suture impressed. Sculpture 
numerous small, regular, raised, spiral ridges, with wider interspaces, 
those just below the suture stronger and more distant; lines of growth 
faint. Aperture narrow-ovate. Outer lip expanded below the suture, 
then regularly rounded, thin; the posterior sinus is broad and shallow ; 
canal short and broad, straight; columella regularly incurved. Epi- 
dermis thin. greenish white. Length, 8°"; breadth, 5"; length of aper- 
ture, 5™"; its breadth, 1.80°"; length of body-whorl, front side, 6.35". 
} 
Stations 891 and 892, in 500 and 487 fathoms; four specimens. 
Pleurotoma (Pleurotomella) Agassizii Verrill & Smith. 
Amer, Journ. Sci., xx, p. 394, for Nov., 1880 (published Oct. 25). 
This large and elegantly sculptured species occurred sparingly, living, 
in many of the off-shore localities (869, 871, 874, 877, 880), in 65 to 252. 
fathoms, but it was taken in larger numbers at stations 891 to 895, in 
238 to 500 fathoms. The two nuclear whorls are very small, chestnut- 
brown, scarcely carinated, rounded, with the surface finely cancellated 
by lines running obliquely, in two directions, but close to the suture 
only the transverse lines appear. 
