FAMILY TURBINID^ MELANIA. 93 



M. dubiosa. (Id. 1. c. pi. 5, fig. 6.) Shell smooth, conical, rather thin. Whorls 7, somewhat convex: 

 sutures linear; spire rather elevated ; aperture elliptical, subangular at the base, rather more 

 than one-third of the total length. Allied to M. simplex of Say. Color, horn ; aperture 

 whitish. Length, 0'75; diameter, 0"3. Tennessee. 



M. ebenum. (Id. 1. c. pi. 5, fig. 7.) Shell smooth, obtusely conical, thick: spire obtuse; sutures 

 small; whorls somewhat convex ; aperture rather large, ovate, subangular at base. Color, 

 black or bluish ; aperture purplish. Length, 0'47; diameter, 0'3. Tennessee. 



M. rufescens. (Id. 1. c. pi. 5, fig. 8.) Shell smooth, turreted, ralherthin, shining: spire elevated; 

 sutures impressed ; whorls 8, convex, carinate towards the apex ; aperture small, elliptical, 

 subangular beneath. CoZor, dark red ; within purplish. Length, 0"85 ; diameter 0" 3. Ten- 

 nessee. 



M. tuberculata. {M. stygia, Sav, Am. Conch. Lea, 1. c. Vol. 4, pi. 15, fig. 3L) Shell robust, 

 conic-ovate : spire rather larger than the aperture, eroded at the tip. Whorls 5, hardly 

 convex ; wrinkles obsolete, except a few larger ones ; aperture narrowed at base into a slight 

 sinus, and subangulated, much widest in the middle ; lip much arched in the middle. Color, 

 black. 'Resembles armif era, but that shell has tubercles and colored lines. Length, 0'75. 

 Tenjiessee. 



M. armigera. (Sav, Ac. Sc. Vol. 2, p. 178.) Shell tapering. Whorls about 6, slightly wrinkled : 

 spire near the apex, eroded ; body-whorl with a revolving series of 5 - 6 distant prominent 

 tubercles, which become obsolete on the spire, and are concealed by the revolutions of the 

 succeeding whorls : hence an appearance of a small subsutural series of tubercles on the 

 body-whorl. Columella with a distinct sinus at the base. Color, brownish horn, with two 

 or three obsolete revolving reddish brown lines ; apex whitish. Length, I'O. Ohio river. 



M. hydei. (Conrad, Fr. Wat. Shells, pi. 8, fig. 1.) Shell conical, rather elevated. Whorls flat- 

 tened, with spiral acute tuberculated lines : one or two on each whorl of the spire, and about 

 four on the body-whorl ; the inferior one plain : aperture elliptical. Alabama. 



M. catenaria. (Say, Ac. Sc. Vol. 2, p. 379.) Shell conic. Whorls 7-8, slightly undulated 

 transversely, and with 8-9 revolving elevated lines, the four or five superior ones of which 

 are almost interrupted between the undulations. Color, blackish. Length, 0'45. South- 

 Carolina. 



M. cancellata. (Say, Des. terr. etc. p. 16.) Shell rather slender, attenuated. Whorls convex, 

 with about twenty-six reclivate longitudinal elevated lines crossed by about eighteen revolv- 

 ing ones, the eight or nine towards the base crowded. Length, 0*8. Allied to catenaria, 

 but more elongated and attenuated. Florida. 



M. fusiformis. (Lea, Tr. Am. Phil. Soc. Vol. 8, p. 167, pi. 5, fig. 9.) Shell smooth, fusiform, 

 rather thin, pointed at the apex: spire short ; sutures linear; whorls 6, the last large and 

 inflated; aperture ovately elongated. Color, yellow; aperture whitish. Length, 0'-5; dia- 

 meter, 27. Tennessee. 



M. clavaformis. (Id. 1. c. pi. 5, fig. 10.) Shell smooth, shining, club-shaped, rather thin: spire 

 acute; sutures somewhat impressed; whorls eight, convex; aperture elongated. Color, 

 chesnut brown ; aperture light purple. Length, 0'67; diameter, 0-27. Tennessee. 



