208 BULLETIN OF THE 
tural band, the surface is covered with microscopic strie#, which, in intersecting 
the inconspicuous lines of growth, give a peculiar crinkled appearance to the 
surface. 
Length, 30 mm. ; breadth, 12 mm.; length of aperture, 15.5 mm.; greatest 
breadth, 5.5 mm. 
This species is easily distinguished by the character of its sculpture. 
Pleurotomella leptalea, sp. nov. 
Plate Il. Figs. 5, 5a. 
One living specimen, Station 325, off Cape Fear, N. C., in 647 fathoms. 
Shell of moderate size, rather stout, very thin and fragile, delicately tinted 
with brown below the chestnut-brown tip, consisting of four obtusely shoul- 
dered whorls besides the nucleus. Aperture long, rather broad, pinched in 
anteriorly, forming a moderately long, narrow canal. Outer lip badly broken, 
but, judging by the lines of growth, sweeps well forward from the posterior 
sinus, which is as wide as the subsutural band, and deepest next the suture. 
Columella very straight for this genus, with a narrow, very thin, closely adher- 
ing layer of enamel. Subsutural band broad, oblique, crossed by numerous very 
delicate curved riblets and lines of growth, most conspicuous just at the su- 
ture. At the angle of the shoulder just below the periphery there is, on the 
two upper whorls, a row of small nodules, which gradually disappear on the 
penultimate whorl and are entirely wanting on the last one. The spiral sculp- 
ture consists of narrow, shallow grooves separated by rather broad, flattened 
bands of nearly uniform width, which cover the entire surface except the sub- 
sutural band and nucleus. Those on the shoulder are a little closer together 
than elsewhere. Lines of growth rather indistinct. Nucleus large, consisting 
of four conspicuously reticulated, chestnut-brown whorls which increase in size 
very abruptly from the very small-apical whorl. 
Length, 12 mm.; breadth, 6 mm.; length of aperture, 7.5 mm.; greatest 
breadth, about 2.5 mm. 
This species more closely resembles the young of P. Emertoni V. & S. (Trans. 
Conn. Acad., VI. p. 154, pl. 31, fig. 6, 1884) than any of the other known 
forms. It can, however, be readily distinguished by its more regularly coiled 
and less acute spire ; less prominent transverse sculpture ; and especially by 
the very different form of the aperture, which in P. Hmertoni is very broad, 
without any clearly defined canal. 
Pleurotomella Dalli, sp. nov. 
Plate Il. Figs. 2, 2a. 
One living specimen, Station 325, off Cape Fear, N. C., in 647 fathoms. 
Shell of moderate size, rather slender, thin, white, with a waxy lustre, con- 
sisting of nine regularly coiled whorls, having a broad oblique subsutural band 
