378 LAND AND KRESH-WATER SHELLS OF N. A. [PART IV. 



Showalter. Tlie lip-cut in this species is not deep, but it is wider 



thau usual, and, being oblique, presents more of the whorl within than 



usual. In the specimen before me there are two small, hair-like 



bands, one im;netliately under the shoulder and the other verj' near 



to the base, and in the middle there is a sliirht indication of a 

 Fig. 710. 



band, but these indistinct bands do not become visible in the 



;||iiB interior except in a very small degree. The shoulder is 



slightly impressed, giving the suture a hem. In color it 



is nearly the same with glans herein described, but it differs 



entirely in the lip-cut, and is a much smaller species with a much 



lower spire. It is very likely that in other specimens the color maj' 



be found to vary. The outer lip stands well off from the body-whorl, 



and the base is subangular. The aperture is more thau one-half the 



length of the shell. The hem is large and well defined. It is near 



to virens (nobis) in outline and size, but diffei's entirely in the color, 



bands and shoulder. — Lea. 



Closely allied to the following species (S. incisum) it may 

 lie distinguished by being heavier, of different color, higher 

 spire and by the body-whorl not being so much flattened 

 around its superior portion. 



26. S. incisum, Lea. 



Anculosa (Schizostoma) iiicisa, Lea, Pliilos. Proc, ii, p. 213, Dec, 1812. Philos. 



Trans., ix, p. 28, t. 9, f. 28. 

 ScMzostoma incisa, Lea, Wheatley, Cat. Shells U. S., p. 28. Hanley, Conch. 



Misc. Melania, t. 5, f. 41, 45. 

 Gyrotoma incisa, Lea, Binney, Check List, No. 323. Bkot, List, p. 27. Adams, 



Genera i, p. 305. 

 Melatuma incisum. Lea, ^lEE^'E. Monog. sp. 4. 

 Melania incisa, Lea, .1 AY, Cat., 4th edit., p. 274. 

 Leptoxis incisa, Lea, Binney, Check List, No. 3G3. Haldeman, Monog., p. 2, 1. 1, 



f. 21-26. 

 Gyrotoma quadrata, Anthony, Proc. Acad. Nat. Sci., p. 65, Feb., 1860. Binney, 



Che(rkList, No.330. 

 Melatoma qtiadratum, Anthony, Reeve, Monojr., fig. Ih (not la. nor 8). 

 Scldzostoma virens. Lea, Proc. Acad. Nut. Sci., p. 187, 1860. Jour. Acad. Nat. Sci., 



V, pt. 3, t. 35, f. 59. Obs., ix, p. 75. 

 Gyrotoma virens, Lea, Binney, Check List, No. 335. Brot, List, p. 28. 

 Gyrotoma obliqua, Anthony, MSS. 



Description. — Shell smooth, ovately gibbous, thick, yellowish- 

 brown; spire short; whorls four, flattened; columella thickened 

 above ; aperture large, ovate, white. 



Habitat. — Alabama. 



Diameter, -44; length, -04 of an inch. — Lea. 



