$8 NEW-YORK FAUNA — MOLLUSCA. 
M. decora. (In. Ib. p. 181, pl. 6, fig. 388.) 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 0°82; 
diameter, 0°26. Tennessee, Kentucky. 
M. costulata. (In. Ib. pl. 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. Zaqueata, but more slender and less diameter. Color, 
yellow ; within bluish. Length, 0°82; diameter, 0°3. Kentucky, Tennessee. — 
M. nitens. (Iv. Ib. p. 182, pl. 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, 
0°3. Tennessee. 
M. deshayesiana. (Iv. Ib. pl. 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. (Ip. Ib. p. 183, pl. 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. babylonica. (Iv. Ib. pl. 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°78; diameter, 0°36. Ohzo. 
M. arata. (Iv. Ib. pl. 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°28. Tenmessee. 
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, 0°S. Var. indented; band almost obsolete. Resembles A. 
procrosus. Kentucky river. 
M. olivula. .(Conrapv, Am. Jour. Vol. 25, p. 342, pl. 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. prastnata. (Conrad, Am. Jour. Vol. 25, pl. 1, fig. 14.) Shell subulate, slightly turreted: 
whorls 7 — 8, 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 coste ; those on the body-whorl crenulated. Alabama. 
