FAMILY PURPURID.E — BUCCINUM. 131 



effaced on the body-whorl : these folds are crossed by numerous, elevated, angular, distant, 

 revolving ribs ; the interstitical spaces reticulate, with revolving and vertical elevated lines. 

 Aperture oblong-oval, rather more than one-half of the length of the shell ; its base emargi- 

 nate. Columella arched, furnished with a broad callus, and twisted on its lower portion. 

 Lip attenuated at the margin, slightly everted, and festooned by the terminations of the 

 revolving ribs. 



Color. Epidermis olivaceous brown, velvety ; beneath light reddish white : aperture yel 

 lowish or soiled white. 



Length, 2-0 -5"0; of aperture, 1-2 -2*6. 



This species occurs on both shores of the Northern Atlantic. On this coast it has been 

 found from New-York to Maine, and farther north. On the coast of this State, it is a rare 

 shell. 



BUCCINUM LUNATUM. 



PLATE VII. FIG. 162.* 



(STATE COLLECTION.) 



Nassa lunata. Say, Journ. Acad. Nat. Sciences, Vol. 5, p. 213. 

 Buccinum lunalum. Adams, Bost. Journ. Nat. Hist. Vol. 2, p. 266. 

 B. id. Gould, Invertebrata of Mass. p. 312, fig. 196. 



Description. Shell very small, conic-oval. Whorls six, nearly smooth, slightly convex : 

 a single revolving line below the suture, and a few around the base ; suture not deeply 

 impressed. Aperture narrow, slightly angulated above, and with a short channel beneath. 

 Columella with a callus : lip simple, dentate on its inner margin ; those above most prominent. 



Color. Reddish brown or yellowish, with one or more series of sublunate white spots on 

 the body-whorl ; occasionally uniform reddish brown. "Animal with the trunk more than 

 half as long as the shell : eyes placed on the base? of the tentacles" (Say). 



Length, CC2. Width, 0-1. 



This species has been found from Georgia to Cape Cod, adhering to stones and seaweed 

 below low-water mark. It is subject to great variations of form and coloring, and perhaps 

 the following maybe considered as identical with this species. 



17* 



