A. E. Verrill — Catalogue of Marine MoUvsea. 
4t;7 
Sars and other European writers. It most resembles, so far as the 
shell is concerned, Sars’ B. assi mills , but the uncini in the latter are 
more slender and more acute. In the uncini our shell agrees closely 
with Sars’ B. rugulata, but the shell that he figures under that name 
is decidedly shorter, with a more obtuse spire and finer sculpture, 
and appears, by the figure, to have spiral lines on the subsutural 
band.* The B. scalaroides Sars also has similar uncini, but in form 
and sculpture the shell does not agree so well. I have, therefore, 
preferred to give this common and well-marked species a distinctive 
name. Even if it should, hereafter, prove to be nonspecific with B. 
rugulata , or B. assimilis (if these be really distinct species), it will 
still be desirable to designate it as a marked variety, for which, var. 
Goiildii would lie an appropriate name. 
Bela exarata (Mdller) H. k A. Adams. 
Defrancia exarata Mdller. Ind. Moll. Grout. Kroyer’s Tidss., iv. p. 85. 1842. 
Beta exarata H. & A. Adams, Genera, i, p. 92, 1858. 
? G. 0. Sars, op. cit., p. 232, pi. 16, tig. 18 ; pi. ix, figs. 1 a, b (dentition, etc.) 
Verrill. Proe. U. S. Nat. Mua.. iii. p. 366. 1880. (in part.) 
Several specimens taken in 5 to 8 fathoms, at Grand Menan Island, 
in 1872, agree accurately with Greenland specimens, sent under the 
name of B. exarata from the museum of Copenhagen. 
These also agree with Holler’s original description, so far as that 
goes, especially in having a short spire. The figure given by G. (). 
Sars represents a longer-spired shell, with more numerous revolving- 
lines and ribs, and a wider canal. 
Our shell is short-fusiform, with the spire short, turreted, acute, 
about as long as the aperture. Whorls six, swollen, nearly squarely 
carinate-shouldered, flattened below the shoulder, but constricted 
at the suture, which is well-impressed and only a little oblique. Ribs 
14 or 15, thick and prominent, nearly straight, obtusely rounded, 
about as wide as their interspaces, which are deeply concavely 
excavated, especially near the shoulder; at the shoulder the ribs rise 
into small, compressed nodules, which are connected by the thin 
revolving carina; in crossing the abrupt subsutural band, the ribs 
are prominent and only slightly bent. The raised revolving cinguli 
are coarse, distinctly thickened in crossing the ribs, producing small 
nodules, so that the surface appears somewhat rough ; the cinguli are 
* It seems to me doubtful whether the *' Beta ruyulata" of other writers is the same 
as Sars apeeies. 
Trans. Conn. Acad., Vol. V. 
56 
May, 1882. 
