408 LAND AND FRESH- WATER SHELLS OF N. A. [PART IV. 



14. A. tseniata, Coxkad. 



Anculotus tcrniatus, Covrad, New Fresh-Water Shells, p. 63, 1834. DeKay, Moll. 



N. v., p. 103. Jav, Cat., 4th edit., p, 270. Reeve, Monog. Anculotus, t. 6, f. 50, 



non t. 2, f. 1.5. MCllek, Synopsis, p. 41, 183'!. 

 Anculosa tceniata, Conrarl, Wheatley, Cat. Sliells U. S., p. 28. 

 Leptoxis tmniata, Conrad, Haldemax, Monog. Leptoxis, t. 3, f. 71-73. Bin'SEY, 



Check List, No. 388. Brot. List, p. 2(5. Adams, Genera, i, p. 307. 

 Anculosa Coosaensis, Lea, Proc. Acid. Nat. Sci., p. 5t, 18G1. Jour. Acad. Nat. Sci., 



V, pt. 3, p. 2.)7, t. 30, f. 65, March, 18G3. Obs., i.\, p. 76. 



Description. — Shell oval, or oblong, olivaceous, with dark green 

 Fio- 813 Fi" 814 spiral bands, four on the body-whorl; one whorl 

 of the spire not eroded, often longitudinally 

 produced. 

 Length, | of au inch. 



Observatio ns. — Inhabits friable calcareous 

 banks of the Alabama River, at Claiborne. It 

 is a pretty species, remarkable for its dark bands, which resemble 

 those of Melania olivula (nobis) of the same locality. — Conrad. 



This shell resembles ruhiginosa and jyrcei'osa and appears 

 to occupy a somevvliat intermediate position between the two. 

 A number of specimens before me, from the Alabama and 

 Coosa Rivers, including author's examples from the former 

 stream, indicate the changes which age produces in this spe- 

 cies. When half grown it appears to be identical with Coo- 

 saensis, Lea, whose description and figure are copied below. 



Anculosa Coosaensis. — Shell smooth, obtusely conical, thick, dark 

 horn-color, very much banded ; spire elevated, obtuse at the apex ; 

 sutures very much impressed; whorls four, very much constricted 

 below the sutures, the last large; aperture rounded, white, mucli 

 banded within ; columella thickened, incurved, dark purple ; 

 outer lip acute and expanded. 



Operculum rather large, elliptical, dark brown, with the 

 polar point close to the left edge towards the base. 



Diameter, -34 ; length, -55 of an inch. 



Observations. — This species is more nearly allied to tintinnabulum 

 (nobis) than any other. It differs in being more elongate, having a 

 higher spire, having a less dilate aperture, and in usually having four 

 bands, the tinlinnabiduni usually having two bands, or being witliout 

 any. In two of the Coosaensis, out of six specimens before me, the 



