APORRHAIS. 319 



Shell whitish, transliieciit ; whorls nine or ten, nearly flat, or very 

 slio-htly convex ; suture well inii)rcssed ; last two whorls 

 nearly smooth ; the others louoitudiually })licate, with mi- 

 croscopic transverse striae ; last whorl sub-carinate ; aper- 

 ture rather less than one fourth the length of the shell, sub- 

 ovate, produced anteriorly. Length, seven tenths of an inch ; 

 breadth, twenty-three hundredths of an inch ; divergence, 



. T. costu- 



twenty-two degrees. una. 



Casco Bay ; taken from the stomach of a haddock in the ^"''"•^'^'^• 

 summer of 1841. 



Although only a single specimen has been obtained, its charac- 

 ters are so obvious that we have not hesitated to describe it. It 

 has no analogue on our coast, to our knowledge ; it, however, re- 

 sembles a very much enlarged T. interrupta, Totten. It is in the 

 cabinet of J. W. Mighels. (Mig-hcls and Adams.) 



Turritella acicula. 



Turritella aa'cula, Stimpsox, Bost. Pr. iv. 15 (1851) ; Shells of New England, 35, pi. 1, 

 fig. 5 ; Cheek Lists, 5. 



Shell small, turreted, subulate, white, thin ; whorls ten, very con- 

 vex, longitudinally striate and bound with transverse ribs, 

 of which three are stoutest ; aperture rounded, eftuso ante- '^' ^ 

 riorly ; peristome acute. Length, twenty-two hundredths of 

 an inch ; breadth, eight hundredths of an inch. 



This species is distinguished from the young of T. erosa 

 by its much more convex whorls and prominent ribs. The 

 operculum appears not to be fimbriated at its edges. r. acku- 



Tliis species has been taken from fishes caught off Lynn Enu-ged. 

 (^Tuffs), also off Cape Ann ; and 1 have taken several from 

 the stomachs of haddock caught in about twenty fathoms, off Marsh- 

 field. Cape Cod to Grand Manan (^Slimpson). 



Family CERITHIID^, Flem. 



Shell spiral, many-whorled ; aperture more or less channelled in 

 front ; outer lip often expanded in the adult. 



Oeniis APOKRHAIS, Aldrovandus. 



Shell turreted, spire long ; aperture long and narrow, termi- 

 nating in a straight canal in front, and in a channel running up the 

 spire posteriorly ; outer lip thickened and widely dilated. 



