COLUMBELLA. 359 



Connecticut, is probably the young of this species, but the rig. 628. 

 name is preoccupied. The animal resembles that of C. 

 liinata, except in its color, which is white. Length, twenty- 

 three thousandths of an inch ; breadth, one hundredth of 

 an inch. Laminarian and Coralline Zones. Eastport Har- a dissim- 

 bor and Grand Manan (^Stimpsoii). 



Columbella lunata. 



Fig. 196. 



Shell small, ovate-conic, surface smooth ; color reddish-brown, with two series 

 of crescent-shaped, whitish spots; aperture oval, its outer lip dark brown, and 

 toothed Avithin. ' 



Nassa lunata, Say, Journ. Acad. Nat. So. v. 21.3. — De Kay, N. Y. Moll. 131, pi. 7,.fig. 1 62*. 

 Baccinum. lunatum, Adams, Bost. Journ. Nat. Hist. ii. 2G6. — Gould, Inv. 1st ed. 312, fig. 



196. 

 Columbella lunaia, Sovverby, Thes. 141, pi. 140, fig. 164. — Stimpson, Check Lists, .5. 



Shell small, ovate-conic ; whorls six, slightly convex, separated 

 by a shallow suture ; surface altogether smooth, excepting a single 

 revolving line below the suture, and a few around the 

 base ; color reddish-brown or fawn color, with two, and 

 sometimes three, series of crescent-shaped, yellowish spots 

 on the lower whorl ; the light color often predominating 

 over the dark ; aperture oval, narrow, with a small sinus 

 or recess at the posterior angle, and endhig in a very short 

 canal in front; outer lip simple, and dark brown, toothed along its 

 inner margin ; pillar covered with brown callus, the outer edge of 

 which is somewhat elevated. Length, one fifth of an inch ; breadth, 

 one tenth of an inch ; divergence, forty-three degrees. 



Found abundantly to the south of Cape Cod, as far north as 

 Provincetown, about Martha's Vineyard, Nantucket, and Buzzard's 

 Bay. Swampscott and Nahant Beaches, alive (Haskell}. Profes- 

 sor Adams remarks that they are found associated, almost without 

 exception, with Bittium nigrum., but much less abundant. In spring 

 they are found upon the surface of the sand. Their station, how- 

 ever, is a few feet below low-water mark, clinging to stones, sea- 

 weed, and other shells. 



The principal variations arise from the greater or less elongation 

 of the spire, and from the different proportions of the brown and 

 white coloring; sometimes the shell is almost entirely brown, and 

 at others there is scarcely enough brown to define the crescentic 

 spots. 



