ANCULOSA. 409 



bands are interrupted, changing tliem to rows of square maculations. 

 Some of tlie specimens are slightly urabilicate. The aperture is 

 rather more than half the lengtli of the shell. — Lea, 



15. A. Troostiana, Lka. 



Anculosa Troostiana, Lea, Philos. Proc, ii, p. 34. Philos. Trans., ix, p. 15. 



Ojs., iv, p. 13. Wheatley, C.it. Shelli U. S., p. 28. 

 Ancitlotus Troostianus, Lea, Reeve, Monog. Auculotus, t. 4, f. 30. 

 Lepioxis Troostiana. Lea, IIaldemax, Jlonog. Leptoxis, p. 4, t. 3, f. 81. Binney, 



Check List. No. 391. Brot, List, p. 20. Adams, Genera, i, p. 307. 



Description. — Shell ovately conical, thiclv, minutely rugose, dark 

 brown ; spire somewhat elevated ; sutures rather impi-essed ; whorls 

 flattened ; aperture rounded, within bluish ; columella thick, white 

 or flesh-colored. 



Habitat. — Tennessee. 



Diameter, -50 ; length, -GO of an inch. 



Observations. — There are many specimens before me, all of which 

 in form are unusually alike, for a species of Anculosa. It dif- 

 fers from other species which have come under my notice in 

 its spire, which is quite elevated, giving it the aspect of the ^Km 



genus Melania. Small, ii-regular wrinkles, or granulations, 



may be observed over the whole surface in most specimens, 



and I believe this will generally be found to be more or less the case 



with most of the species. — Lea. 



Tliis is a small, ponderous, compact species, with a pecu- 

 liarly dark epidermis, and is not likely to be confounded with 

 any other. The figure is from one of Mr. Lea's types, which 

 he kindly presented to me. Anculosa ^lelanoides, Conrad 

 {tnrr/ida, Ilaldeman), differs from this in being narrower, and 

 in the aperture being produced instead of rounded at the base. 



16. A. pinguis, Lea. 



Melania pinguis, Lea, Philos. Trans., x, p. 301, t. 30, f. 11 Obs., v, p. 57. Binney, 

 Check List, No. 200. Brot, List, p. 40. Keeve, Monog. Melania, sp. 355. 



Description. — Shell smooth, inflated, almost round, very thick, 

 dark brown ; spire very obtusel}' conical ; sutures impressed ; whorls 

 a little convex ; aperture very large and rounded, within either white 

 or purple ; columella incurved and thickened. 



