FAMILY TURBINIOE MELANIA. 95 



solete revolving reddish lines. Length, 1-1; diameter, 0-4. One of the largest of the 

 genus. Ohio. 



M. arnica. (Say, Ac. Sc. Vol. 2, p. 176.) Shell conic, rapidly attenuating to an apex, very 

 slightly wrinkled: suture not deeply impressed. Whorls 7 - S ; aperture oblique, equalling 

 the second, third and fourth whorls together. Color, olivaceous, occasionally with one to 

 three revolving rufous or blackish lines. Length 0'6. An anculolus ? Ohio river. 



M. nickliniana. (Lea, Am. Phil. Tr. Vol. 8, p. 171, pi. 5, fig. IS.) Shell smooth, obtusely 

 conical, solid; sutures impressed; whorls six, slightly convex ; aperture large, somewhat 

 rounded. Color, very dark, occasionally banded ; aperture purple. Length, - 45; diameter, 

 • 27. Virginia. 



M. viridis. (Id. 1. c. pi. 5, fig. 19.) Shell smooth, subfusifonn, rather thick ; spire short, ob- 

 tusely conical ; sutures linear ; whorls 5, somewhat convex ; aperture ovate, rather large. 

 Color, green; aperture white. Length, - 32; diameter, - 27. Ohio. 



M. occidentalis. (Id. 1. c. pi. 5, fig. 20.) Shell smooth, subglobose, rather thick ; spire short, 

 pointed ; sutures linear ; whorls four, rather convex, occasionally with raised revolving stria? ; 

 aperture large, ovate, nearly three-quarters of the total length. Color, green ; within purple 

 or white. Closely allied to the M. subglobosa of Say. Length, 0-37 ; diameter, 0-3. Ohio. 



M. globula. (Id. 1. c. pi. 5, fig. 22.) Shell very small, smooth, subglobose ; spire short; sutures 

 impressed; whorls four, rather convex; aperture large, nearly two-thirds of total length, 

 nearly round. Color, dark brown, with two darker revolving bands ; . aperture bluish. 

 Length, 0~25; diameter, 0.22. Tennessee. 



M. altilis. (Id. 1. c. pi. 5, fig. 23.) Shell smooth, subglobose, thick ; spire short ; sutures small ; 

 whorls four, obtusely angular above ; aperture large, nearly round. Color, pale horn. Length, 

 0'32; diameter, 0'27. Maryland, South-Carolina. 



M. strigosa. (Id. 1. c. pi. 5, fig. 24.) Shell smooth, acutely turreted, thin, striate above ; spire 

 drawn out ; sutures impressed; whorls 9, flattened; aperture small, elliptical, angulated at 

 the base. Color, pale yellow ; bluish within. Length, - 85; diameter, 0' 27. 



M. virgata. (Id. I.e. pi. 5, fig. 25.) Shell smooth, rounded, rather thin, shining; spire short; 

 sutures linear; whorls convex ; aperture half the total length, elliptical. Color, yellow, with 

 two broad bands. Length, 0'3; diameter, 0'2. Tennessee. 



M. tenebrosa. (Id. 1. c. pi. 5, fig. 26.) Shell smooth, conical, rather thick; spire rather elevated ; 

 sutures impressed; whorls flattened; aperture rather large, elliptical, angular at the base. 

 Color, nearly black ; within bluish. Length, - 72; diameter, - 3. Tennessee. 



M. cincinnatensis. (Lea, Am. Jour. Vol. 38, p. 175; Am. Phil. Tr. Vol. 8, p. 190, pi. 6, fig. 58.) 

 Shell minute, much depressed, compressed beneath, bicarinate, with an acute apex ; whorls 

 four; aperture subrounded. Color, fuscous, trifasciate. Length, 0-16; diameter, - 14. 

 Cincinnati. 



M. comma. (Conrad, op. cit. pi. 8, fig. 7.) Shell subulate, much elongated, slender. Whorls 

 8-9, flattened, indented at the sutures, with longitudinal distant slightly arcuated ribs, dis- 

 appearing on the lower whorls ; lip thin ; aperture elliptical, produced at the base. Color, 

 olive, with a dark band above the middle of each whorl. Alabama. 



