A. FE. Verrill— Catalogue of Marine Mollusca. 45: 
Ww 
subsutural shoulder. Nucleus small, brown, acute, of three whorls, 
which are obliquely sculptured. Other whorls polished and shining, 
but, in some lights, often showing faint, microscopic, oblique lines, 
and lines of growth; the nodules below the sutures are smooth and 
rounded, small, and separated by intervals about equal to their 
breadth ; canal with a few spiral limes close to tip. Aperture fusi- 
form; notch broad ;.canal short, narrowed to the end. Length, 
g5™"; greatest breadth, 4:5"; length of body-whorl and canal, 
6™™ ; of aperture, 4°75"; breadth of aperture, 2". 
Four living specimens of this elegant shell were taken off Martha’s 
Vineyard, at station 994, in 368 fathoms. Gulf of Mexico, 447-805 
fathoms (Dall). | 
This species has no operculum; the eyes are minute. It is, there- 
fore, not a Bela, as Mr. Dall admitted, after examining an alcoholic 
specimen, sent by me for comparison with his type. I have also had 
an opportunity to compare his specimens with my own. 
Pleurotomella Verrill. 
Amer. Journ. Sci., v, p. 15, Dee., 1872. 
Shell elongated, with a high spire. Whorls usually angulated or 
shouldered; a large, concave, subsutural band; and usually with 
transverse sigmoid ribs. Canal slightly produced. Lip with a dis- 
tinct, often deep notch, just below the suture. Operculum absent. 
Eyes none. Tentacles well-developed. Uneini nearly as in Bela, 
Type, P. Packardii Verrill. 
Pleurotomella Packardii Verrill. 
Pleurotomella Packardii Verrill, Amer. Journ. Sci., v, p. 15, Dec., 1872; Trans. 
Conn. Acad., iii, p. 48, 1874. 
Puate XLITI, rigurRE 9; PLATE LVII, FIGURE 5. 
The later examples are all smaller than the original type (fig. 9), 
but agree with it closely, in sculpture, except that some of the 
younger examples have the spiral lines coarser and more prominent, 
while the subsutured band is crossed by well-marked, strongly curved 
riblets. Some young shells have the transverse coste so prominent 
as to give the whorls a decidedly angulated or shouldered appear- 
ance. The two nuclear whorls are small, deep chestnut-brown, mi- 
nutely decussated by fine oblique lines. The normal sculpture be- 
gins on the next whorl. 
