APOREHAIS. 319 



Shell whitish, translucent ; whorls nine or ten, nearly fiat, or very 

 slio-htly convex ; suture well impressed ; last two whorls 



. . Fig. 587. 



nearly smooth ; the others longitudinally plicate, 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 ; 

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

 twenty-two degrees. '^'lauf.'^ 



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

 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. (^3Iig-hels and Adams.} 



Turritella acicula. 



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

 fig. 5 ; Check Lists, 5. 



Shell small, turreted, sul)ulate, white, thin ; whorls ten, very con- 

 vex, longitudinally striate and bound with transverse ribs, 

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

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

 an inch ; breadtli, 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 a[)pears not to be fimbriated at its edges. 



This species has been taken from fishes caught off Lynn 

 {Tufts), also off Cape Ann; and I have taken several from 

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

 field. Cape Cod to Grand Manan QStimpson). 



Family CERITHIID^E, Flem. 



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

 front ; outer lip often expanded in the adult. 



Oeiius 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. 



