418 LAND AXD FRESH-WATER SHELLS OF N. A. [PART IV. 



near the base of the shell; the middle bands are often confluent, and 

 all of them are arrested by a broad area before they reach the outer 

 edge. — Anthowj. 



The figure is from a type specimen. Tlie body-wliorl is 

 slightly arigulated in most of the specimens before me. 



24. A. Lewisii, Lea. 



Anculosa Lewisii, Lea, Troc. Acad. Nat. Soi., p. 5t, 1831. Jour. Acad. Nat. Sci., 

 V, pt. 3, p. 257, t. 35, f. Gl, March, 1S()3. Obs., ix, p. 79. 



Description. — Shell smooth, elliptical, rather thick, somewhat in- 

 flated, 3'ellovvish horn-color; spire obtuse, scarcely exserted, acumi- 

 nate; sutures scarcely impressed; whorls five, the last very large; 

 aperture large, regularly ovate, whitish within; columella incurved, 

 a little thickened above and below; outer lip acute, somewhat ex- 

 panded and slightly sinuous. 



Operculum rather large, very dark brown, ovate, with the polar 

 point very near the base on the left. 



//a^i^ai;.— Tennessee; James Lewis, M.D. 



Diameter, -30; length, -58 of an inch. 



Observations. — Dr. Lewis sent me three specimens for examination ; 

 p. 5,3. I presume all he had received from Tennessee. It is quite 

 distinct from any Ancnlosa I have seen. It verges toward 

 the genus Lilhasia in some of its charact .rs. It reminds 

 "' one of Melania obovata, Say, which probably should be re- 

 moved from that genus to this. The aperture is more 

 rounded at the base than in that shell, and the spire is much more 

 obtuse, giving the outline of the two shells a very different appear- 

 ance. It reminds one of the genus Chilina, Gray, but cannot be 

 mistaken for that genus. The last whorl is so large tliat it nearly 

 covers up the spire and leaves only a small portion extruded. Two 

 of the specimens exhibit near the apex quite a disposition in the 

 young to be carinate. In an immature state, therefore, they would 

 present quite a difi'erent appearance, as the shoulder would be quite 

 square. — Lea. 



25. A. squalida, Lea. 



Anculosa squnlida, LEA, Philos. Pioc, iv, p. 107, Aug., 1845. Philos. Trans., x, p. 



6(>, t. 9, f. 50. Obs., iv. p. 6(). 

 Leptoxis squalida. Lea, Binnet, Check List, No. 386. Brot, List, p. 25. ADAM8, 



Genera, i, p. 307. 



