PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 323 



tubercles, back from the margin, aDcl a larger conical one at tlie base 

 of the canal. 



Columella signoid, a little excavated in the middle, and with a distinct, 

 raised, spiral fold at its inner edge anteriorly; canal sliort, open, very 

 slightly curved. Epidermis thin, closely adherent, minutely lamellose 

 along the lines of growth, pale greenish or yellowish white, sometimes 

 with microscopic spiral striations. 



Length of one of the largest specimens, 12'"'" ; breadth, 4'""* ; length 

 of body-whorl and canal, 7'"™; length of aperture, 5'"'"; its breadth, 

 1.8'"'". Some specimens are stouter and shorter. 



'Off Martha's Vineyard, in 65 to 487 fathoms, 1880 and 1881,— IT. S. 

 Fish Commission. Taken at many stations. Off Chesapeake Bay, 300 

 fathoms, — Lieut. Z. L. Tanner. 



It occurred in considerable numbers at stations 870, 87G, in 155 and 

 120 fothoms. 



The true A. rosacea occurs in shallow water from oil' Cape Cod north- 

 ward to Nova Scotia. It differs much from A. EUlholli, of Greenland, 

 and if the latter is not a distinct species, it is, at least, a ver^- marked 

 variety. 



Astijris pura Verrill. 



Astyris zonalis, pars (white var.), Verrill, Proc. Nat. Mus., iii, p. 408, 1881 



(«o« Linsley). 

 Astyris pura Verrill, Trans. Conn. Acad., v, p. 515, June, 1882, 



This shell, formerly supposed to be a white deep-water variety of A. 

 zonalis {=A. dissimilis St.), proves to be distinct from the latter. 



. It is a stouter shell with a narrower, blunter spire, a larger nucleus, 

 and a wider aperture. It has a more distinct caiml, which is a little 

 curved at the tip. The surface is nearly smooth, except a few faint 

 spiral lines on the canal. Shell pure white or pinkish, translucent, 

 usually with the ai)ex distinctly pink or yellowish. It is very common 

 off Martha's Vineyard, in 100 to 487 fathoms.* 



TOXOGLOSSA. 



Pleurotoma Dalli Verrill and Smith. 



Veriill, Trans. Conn. Acad., v, p. 451, pi. 57, figs. 1, la, April, 1882. 



A slender, transversely ribbed species, remarkable for the deep notch, 

 widest within, and the deeply concave subsutural band. 



Whorls ten, somewhat angular and shouldered, crossed by strongly 

 marked, somewhat oblique, angular ribs, which are most elevated at 

 the shoulder, below the strongly marked, concave, subsutural band ; 

 they do not extend on this band, and mostly fade out below, before 

 reaching the suture ; ou the body-whorl the ribs are less distinct and 

 sometimes absent; when present they extend only a little below the 

 suture. The whole surface is covered with fine, wavy, spiral lines; 



* The true A. zonalis also occurred from near the shore to 120 fathoms. Those from 

 the decider localities were highly colored and banded like the shore specimens. 



