98 NEW-YORK FAUNA MOLLUSCA. 



M. decora. (Id. lb. p. 181, pi. 6, fig. 38.) Shell folded except on the two lowest whorls, acutely 

 turreted, rather thin, striate above : spire acute, elevated ; sutures impressed ; whorls nine, 

 rather flattened; aperture small, elliptical. Color, horn; within whitish. Length - 82 ; 

 diameter, - 26. Tennessee, Kentucky. 



M. costulata. (Id. lb. pi. 6, fig. 39.) Shell folded, conoidal, rather thin, carinate above: spire 

 rather elongated ; sutures impressed ; whorls nine, rather convex ; aperture subovate, one- 

 third of total length. Allied to M. laqueata, but more slender and less diameter. Color, 

 yellow; within bluish. Length, 0'82; diameter, Q - 3. Kentucky, Tomessee. 



M. nitens. (Id. lb. p. 182, pi. 6, fig. 40.) Shell folded, shining, somewhat thick : spire obtuse ; 

 sutures impressed ; whorls seven, somewhat convex ; aperture elliptical, angular at base, 

 one-third of total length. Color, dark brown; reddish within. Length, 0*76; diameter, 

 ' 3. Tennessee. 



M. deshayesiana. (Id. lb. pi. 6, fig. 41.) Shell folded, conoidal, thin : spire rather elevated ; sutures 

 impressed ; whorls eight, rather convex, striate above ; aperture about one-third of total 

 length, elliptical, somewhat angular at base. Color, dark horn; within whitish. Length, 

 0"85; diameter, 0' 35. Tennessee. 



M. concinna. (Id. lb. p. 183, pi. 6, fig. 42.) Shell folded, transversely striate above, acutely 

 turreted, thin : spire drawn out ; sutures impressed ; whorls nine, carinate, flattened ; aper- 

 ture about one-fourth of total length, elliptical, angular at base. Color, brown ; within whitish. 

 Length, 0-75 ; width, 0-25. Tennessee. 



M. labylonica. (Id. lb. pi. 6. fig. 43.) Shell carinate, turreted, rather thick : spire rather ele- 

 vated, striate at the apex; sutures impressed ; whorls seven, angular above ; aperture rather 

 large, more than one-third of total length, elliptical. Length, 0'7S; diameter, 0'36. Ohio. 



M. arata. (Id. lb. pi. 6. fig. 44.) Shell carinated, conical, rather thick : sutures rather deeply 

 grooved ; whorls flattened, carinate ; aperture small, angular at the base and channelled. 

 Color, black ; dark within. Length, 0" 57; diameter, 0'2S. Tennessee. 



M. ? obovata. (Say, Desc. terr. etc. p. 18.) Shell subobvate: whorls nearly 5; spire remarkably 

 rounded, short ; body-whorl with a very obtuse slightly indented band a little above the mid- 

 dle ; aperture narrow, more than twice the length of the spire ; pillar-lip polished, with a 

 callus above ; lip not projecting near the base, subrectilinear from the shoulder to the basal 

 curve, very convex at the shoulder ; base rounded, and without indentation. Color, dark- 

 brown or blackish. Length, - S. Var. indented; band almost obsolete. Resembles A. 

 proerosus. Kentucky river. 



M. olivula. (Conrad, Am. Jour. Vol. 25, p. 342, pi. 1, fig. 13.) Shell oblong or elliptical, smooth, 

 entire : spire conical ; whorls 5 ; suture impressed ; aperture somewhat elliptical longitudi- 

 nally. Color, olive-green, about half the length of the shell, with strongly marked brown 

 revolving bands; about 4 on the body-whorl. Var. a. with apex eroded, whorl flattened, and 

 spire less conical. Alabama. 



M. prasinata. (Conrad, Am. Jour. Vol.25, pi. 1, fig. 14.) Shell subulate, slightly turreted: 

 whorls 7 - S, flattened ; aperture elliptical, a little oblique, about one-third the length of the 

 shell; body-whorl subangulated at the base. Color: epidermis olive-green. Var. a. with 

 broad revolving costoe ; those on the body-whorl crenulated. Alabama. 



