PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 365 
Below the shoulder the cinguli are numerous and prominent, crossing 
the prominent narrow ribs so as to produce a distinct, but not coarse, 
cancellation. It most resembles the figures of B. elegans and B. angu- 
losa of Sars. Itis perhaps the original B. declivis (Lovén), but does not 
agree with Sars’s figure. 
Bela tenuicostata M. Sars. 
G. O. Sars, op. cit., p. 287, pl. 17, figs. 1 a, b; pl. ix, fig. 6 (dentition). 
Specimens apparently identical with this species were dredged by me, 
in moderate depths, at Eastport, Me., in 1864, 1868, and 1870. It was 
also taken this season at stations 893 and 894, in 365 to 372 fathoms. It 
is Closely related to B. decussata Couth., but has smaller and more numer- 
ous ribs, and is, therefore, more finely cancellated. It may be only ¢ 
variety of B. decussata. The latter is easily distinguished from all our 
other species by its oval form, rounded, scarcely shouldered whorls, 
crossed by very numerous small, narrow, flexuous, sigmoid ribs, which 
are strongly bent backward near the suture, in conformity with the very 
distinct, rounded sinus of the lip. The whole surface, except close to 
the deep suture, is covered with numerous rather fine, close, raised, 
revolying cinguli, giving the surface a rather finely and regularly can- 
cellated structure. 
Bela Trevelyana (Turton) H. & A. Adams. 
This has been recorded by Jeffreys from the Gulf of Saint Lawrence. 
He formerly united B. decussata with it, but has subsequently (in Mol- 
lusea of Valorous Expedition) distinguished them. I have myself seen 
no American shells agreeing clearly with English specimens of B. 
Trevelyana. The latter resembles B. decussata in form and size, but has 
the ribs nearly straight and the cancellation coarser than in our shell. 
Bela impressa ? (Beck) Morch, Catal. Moll. Spitzberg, p. 17, 1869. 
Pleurotoma impressa Leche, Kong]. Svenska Vet.-Akad. Handl., Bd. 16, p. 54, 
pl. 1, fig. 16, 1878 (author’s separate copy). 
I refer doubtfully to this species a small but very distinct shell 
frequently dredged by us, in 10 to 70 fathoms, all along the coast, from 
off Cape Cod to Nova Scotia. It was also dredged this season at sta- 
tions 812 to 815, in 27 fathoms, off Block Island. 
The shell is greenish white, short-oval, with about five whorls, which 
are distinctly flattened and angularly shouldered near the deep suture. 
There are on the last whorl about twenty rather broad, flat ribs, which 
are a little prominent and usually slightly nodose at the shoulder, but 
they disappear a short distance below. The most characteristic feature 
is that the surface is marked by rather fine, but regular and distinct, 
revolving grooves or sulci, which are rather distant, with flat intervals. 
Of these there are usually about three or four on the penultimate whorl, 
and about twenty on the last, the greater number being below the mid- 
dle, on the siphon, where they become closer; one of the sulci, just below 
