302 LITTORINID^. 



on the upper half, and revolving impressed strise on the lower half; 

 last whorl carinate ; spire conical, obtuse, suture well impressed ; 

 aperture nearly orbicular ; labrum thin, sharp ; labium 

 smooth, operculum horny. Length, eleven hundredths of 

 an inch ; breadth, seven tenths of an inch ; divergence, forty- 

 five degrees. 



Casco Bay ; taken from the stomachs of haddock in the 



summer of 1841. 



We offer this with some hesitation as identical with Turbo semi- 



costatus, Montagu. If it should finally prove to be distinct, we 



would propose to call it Cing-tila carinata (^Mighels and Adams'). 



Grand Manan (^Stimpson). 



Oemis L,ACi;i\A, Turton. 1827. 



Shell globose or conical, thin ; spire consisting of a few rapidly 

 enlarging whorls ; aperture semi-lunar ; inner lip oblique, flattened; 

 umbilicus forming a lengthened groove along the pillar. 



Lacuna vincta. 



Figs. 169, 178*. 



Shell small, ovate-conical, with five rounded volutions, encircled by four or 

 five purplish-brown bands, and very numerous, minute, undulating lines. 



Turbo viiidiis, Montagu, Test. Brit. 307, pi. 20, fig. 3. — Turtox, Condi. Diet 19.5, 

 f]g.s. 92, 93. — Wood, Index, pi. 31, fig. 69. — Dillwyn, Catal. ii. S44. — Maton 

 and TJackett, Lin Trans, viii. 167. 



Titrbo qnadrifasciatus, Flemixg, Brit. Anim. 299. 



Lacmui pertusn, Conrad. ,Journ. Acad. Nat. Sc. vl. 266, pi. 11, fig. 19. 



Lacuna vinrtn, Gould, Inv. 1st cd. 262, figs. 169, 178*. — Dk Kay, N. Y. Moll. Ill, pi. 

 6, fig. 119. — Stimpson, Check Lists, 4. 



Shell small, thin, ovate-conic ; spire pointed, composed of five 

 very convex whorls, separated by a fine and deep suture, of a dingy 

 white or purplish horn color ; the lower one encircled by 

 four darker chestnut colored bands, two of which revolve 

 upon the posterior whorls also ; the surface is also marked 

 by faint lines of growth, and numerous, fiexuous, revolving 

 marks, which require a magnifier to render them conspicu- 

 ous ; aperture nearly orbicular ; outer lip sharp, thin, and 

 simple , pillar lip white, flattened, and excavated by a smooth, 

 crescent-shaped groove, terminating in an umbilicus ; as the two 

 margins join each other at the base, they form a slight projecting 



