400 LAND AND FRESn-WATEU SHELLS OF N. A. [PART IV. 



Description. — Shell conical, with three entire volutions; apex 

 eroded; whorls flattened, rounded only at the sutures; lines of 

 growth prominent; body-whorl abruptly rounded; epidermis black- 

 Flff 'W Fin- -95 ish, obscurely banded; aperture elliptical, about 

 half the length of the shell. 

 Habitat. — Inhabits rivers in North Alabama. 

 Length, ^ of an inch. — Conrad. 



Figure 794 is from a type specimen in the possession of 

 Mr. Anthon}'. The shell has been cleaned, exhibiting a light 

 green epidermis. Lejytoxis turgkla of Ilaldeman is identical 

 with this species. The following is the description : — 



Leptoxis turrjida. — Shell composed of four flat turns; spire and 

 aperture of equal length ; posterior (upper) end of the rig. 796. 

 labrum advanced upon the body-whorl which swells into 

 the aperture at this point ; color light green, translucent. 



Habitat. — Alabama. 



Length, i of an inch. 



Observations. — Resembles somewhat the Paludina {Jludalia') dis- 

 similis, Say.— Haldeman. 



5. Shell smooth, globose, or flattened above. 

 li. A. trilineata, Say. 



Melania trilineata, SAY, New Harmony Dissem., No. 18, p. 227, Sept. 9, 1829. Say's 



Reprint, p. 19, 1840. BiXNEY'S edition, p. 144. Catlow, Conch. Nomenc, p. 189. 

 Anculosa trilineata, Say, DeKay, Moll. N. Y., p. 100. AVheatley, Cat. Shells U. S., 



p. 27. Jay, Cat. Shells, ?,yA edit., p. G2. 

 Anculotus trilineatus. Say, Jay, Cat., 4th edit., p. 270. Reeve, Mouog. Aneulotus, 



t. 5, f. 416. 

 Leptoxis trilineata, Say, Haldeman, Monog. Leptoxis, p. 5, t. 5, f. 134-144. Bin'XEY, 



Check List, No. 389. BuoT, List, p. 26. 



Variety. 



Melania viridis. Lea, Philos. Proc, ii, p. 12, Feb. 1841. Philos. Trans., viii, p. 172. 

 t. 5, f. 19. Obs., ii, p. 12. DeKay, Moll. N. Y., p. 95. Wiieatley, Cat. Shells 

 U. S., p. 27. BiNNEY, Check List, No. 292. Catlow, Conch. Nomenc, p. 189. 



Description. — Shell subglobose oval, yellowish, more or less tinged 

 with bi'own; volutions about four, rounded, somewhat wrinkled; 

 spire short, i*ather more than half the length of the aperture ; suture 

 not very deeply impressed; body- whorl with three brownish-black 

 revolving lines, of which the two inferior ones are nearest together, 



