ODOSTOMIA. 357 



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



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

 spicuous. Length, 4 mill. 



Massachusetts. 

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



White, smooth; whorls 4, flattened, periphery obtusely angu- 

 lated, suture impressed ; columellar fold small, oblique. 



Length, 3'5 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 by three spiral lines, giving 

 a granulated appearance, the folds terminate at the periphery, 

 below it on the body-whorl are four spiral striae; suture distinct, 

 indistinctly margined ; pillar fold inconspicuous; glossy white, 

 translucent. Length, 3'75 mill. 



New England to Florida. 

 0. BISUTURALIS, Say. PI. 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 Rissoa rupestris, Forbes, are 

 synonyms. 



0. CEDROSA, Ball. PI. 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 very faint ; no umbilicus. 



Length, 5 - 5 mill. 



Cedar Keys, Fla., on mud flats. 



0. L^VJGATA, d'Orb. Pi. 78, fig. 44. 



Thin, oblong, whitish, smooth, shining; whorls 6, slightly 

 convex, suture opaquely margined, columella with a very slight 

 fold. Length, 4 mill. 



St. Thomas, W. Indies. 



