338 LAND AND FRESIl-WATER SHELLS OF N. A. [pART IV. 



It is a beautiful species and occurs not infrequent!}' in the 

 Coosa River. 



Melania crebristriata. — Shell transversely and very closely striate, 

 nearly fusiform, thick, yellowish horn-color; spire obtuse; sutures 

 impressed; whorls somewhat convex; aperture small, rather ovate, 

 angular at the base, within whitish ; columella inflected and thickened 

 above. 

 Habitat. — Tuscaloosa, Alabama. 

 Diameter, -40; length, -76 of an inch. 



Observations. — This species is nearly allied to M. impressa (nobis), 

 but may be distinguished by its color being yellowish, and by its 

 Fig. 647. coarser strise. Its aperture also is smaller. The three 

 specimens before me are very differently banded, one 

 having nine, another three, and the last a rather broad 

 one near the upper part of the whorl. These arc only 

 seen on the inside. The apex of each being eroded, the 

 number of the whorls could not be accurately counted 

 Perhaps there are six. The striae are so strong that they cause the 

 edge of the outer lip to be crenate. The aperture is about two-fifths 

 the length of the shell. On the superior whorls there are broad, 

 slightly elevated, somewhat oblique ribs. The number of striae on 

 the three specimens before me are, respectively, sixteen, eighteen and 

 twenty. — Lea. 



254. G. pergrata. Lea. 



Mdania pergrata, Lea, Proc. Acad. Nat. Sci.. p. 122, 1861. 



Goniobasis pergrata, LEA, Jour. Acad. Nat. Sci., v, pt. 3, p. 243, March, 18()3. Obs., 

 ix, p. 65. 



Description. — Shell striate, subcylindrical, obtusely conical, some- 

 what thick, greenish horn-color; spire very obtuse; sutures very 

 much impressed; whorls six, shouldered above, covered with trans- 

 verse striae, the last very large and cylindrical ; aperture large, elou- 

 gately ovate, whitish within; outer lip acute; columella arcuate, 

 slightly callous above, somewhat rounded at the base. 



Operculum ovate, spiral, dark brown, with the polar point on the 

 edge near to the base. 



Habitat.— Coo&a.'R'w'cr, Alabama; E. R. Showalter, M.D. 



Diameter, -44 ; length, -90 of an inch. 



Observations. — This species reminds one of M. crebristriata, 31. cap- 



