FAMILY TURBINID^ MELANIA. 95 



Solete revolving reddish lines. Length, Tl; 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 anculotus ? 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. Co/or, very dark, occasionally banded ; aperture purple. Length, 0-45 ; diameter, 

 0'27, Virginia. 



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

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

 Color, green; aperture white. Length, 0-32; diameter, 0-27. 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 stris ; 

 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. Te?messee. 



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

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

 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, 0'85; diameter, 0'27. 



M. mrgata. (Id. 1. c. pi. 5, fig. 25.) Shell smooth, rounded, rather thin, shining; spire short; 

 sutures linear; whorls convex ; aperture half the total length, elliptical. CoZor, 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, 0'72; diameter, 0-3. Tennessee. 



M.oinainnatemis. (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, irifasciate. Length, 0'16; diameter, 0"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. 



