ODOSTOMIA. 357 



0. DEALBATA, Stimpson. PI. 78, fig. 40. 



White, smooth, pellucid ; whorls 6, rather convex, fold incon- 

 spicuous. Length, 4 mill. 



3IassacJiusetts. 

 0. MODESTA, Stimpson. PL 78, fig. 39. 



White, smooth; whorls 4, flattened, pei'iphery obtuselj' angu- 

 lated, suture impressed ; columellar fold small, oblique. 



Length, o'5 mill. 



St. George's Banks. 

 0. SEMiNUDA, Adams. PI. 78, fig. 35. 



Whorls 7, convex, those of the spire and upper half of the 

 body longitudinally plicate, crossed b}^ three spiral lines, giving 

 a granulated appearance, the folds terminate at the peripher}?, 

 below it on the bodv-wliorl are four spiral striaa; suture distinct, 

 indistinctly margined ; pillar fold inconspicuous; gloss}^ white, 

 translucent. Length, 375 mill. 



New England to Florida. 

 0. BisuTURALTS, Say. PL 78, fig. 38. 



Smooth, epidermis light brownish; whorls 5-6, with an im- 

 pressed revolving line below the suture, periphery obtusely 

 angulated. Length, 5 mill. 



New England. 



Jaminea exigua, Couth., and Bissoa rupestris, Forbes, are 

 synonyms. 



0. CEDROSA, DalL PL 78, fig. 42, 



Whitish, thin, seven whorls, reticulated by longitudinal plica- 

 tions and narrower interspaces and revolving striae, at the per- 

 iphery the plications cease, but the spiral sculpture is continued 

 to the base, but fainter and closer, suture submargined by a 

 deeper line ; white ; fold obsolete or ver^- faint ; no umbilicus. 



Length, 55 mill. 



Cedar Keys, Fla., on mud flats. 



0. L^VJGATA, d"Orb. PI. 78, fig. 44. 



Thin, oblong, whitish, smooth, shining; whorls 6, slightl}-^ 

 convex, suture opaquely margined, columella with a very slight 

 fold. Length, 4 mill. 



St. Thomas, W. Indies. 



