BARTSCH: NEW ENGLAND PYRAMIDELLIDAE. 109 
Shell ovate-conic, white, smooth, pellucid; whorls six, rather convex; 
aperture ovate, hardly effuse; furnished with a small inconspicuous 
fold. Length, seventeen hundredths of an inch; breadth, six and a 
half hundredths of an inch. 
The above is Stimpson's original description based on a specimen 
from Boston Harbor, Mass. We have not seen the species. 
LiosTOMiA G. O. Sars. 
Liostomia G. O. Sars, Moll. reg. arct. Norveg., p. 205, 1878. 
Shell without axial or spiral sculpture, columellar fold absent. 
Type, Rissoa ehurnea Stimpson. 
Odostomia (Liostomia) eburnea (Stimpson). 
Rissoa eburnea Stimpson, Proc. Boston soc. nat. hist., vol. 4, p. 14, 1851; 
Shells of New England, p. 34, pi. 1, fig. 1, 1851. 
Shell small, ovate conic, white, shining, smooth. Whorls 4, 
rather convex, subangulated at the suture, aperture ovate-elliptic, 
anteriorly effuse, lip thin, simple, acute. 
Length, 4.0 mm.; diameter, 2.3 mm. 
Two specimens were taken in thirty fathoms off Cape Ann. 
The above description is from the original diagnosis by Stimpson; 
we have not seen specimens of the species. 
COUTHOUYELLA new genus. 
Animal without radula, eyes sessile at the outer bases of the tentacles. 
Shell elongate-conic, many whorled, spirally grooved, operculum thin, 
horny, paucispiral. 
T\']ie, Pyramis striatula Couthouy. 
The species for which the present genus has been erected, has en- 
joyed rather varied experiences. It was described under Pyramis, a 
genus without status; from this it was transferred to the Pyramidellid 
genus Odostomia and later to Menestho. It has certain superficial 
resemblances to Actaeopyramis, part of whose species have at times 
been considered under Menestho. The resemblance, however, is 
