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262 LAXD AND FRESH-WATER SHELLS OF N. A. [pART IV. 



Goniobasis Prairiensis. — Shell smooth, elongately fusiform, thin, 

 olivaceous, shining, four-banded ; spire raised, sharp-pointed ; sutures 

 regularly impressed ; Avhorls niue, flattened ; aperture rather large. 

 Fig. 503. subrhoraboidal, -whitish ar.d four-banded Avithin; outer Up 

 acute and sinuous; columella bent in and twisted. 



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

 left, one-fourth above the basal margin. 



Habitat. — Big I'rairie Creek, Alabama; E. R. Showalter, M.D. 

 Diameter, -35 ; length, -85 of an inch. 

 Observations. — Among some twenty specimens before me there is 

 no diflerence in form or markings, except that some have the bands 

 slightlj' broader than others. The two middle bands are rather closer 

 together and the under one of these two is generally the smaller. 

 It was sent to me by Dr. Showalter under the name of M. grata, 

 Anth., but while it has the four bands like that species, it is more 

 slender, is not yellow, has a less aperture and one more whorl, and is 

 more fusiform. The aperture is rather more than one-third the 

 length of the shell. — Lea. 



Mr. Anthony's types of M. grata are before me, and do not 

 represent the shell, which Mr. Lea distinguishes in the above 

 description by that name, but are identical in every respect 

 with G. Prairiensis. The shell which Mr. Lea mistook for 

 M. grata, he has since described as quadricincta. 



160. G. quadxicincta, Lea. 



Goniobasis quadricincta, LEA, Proc. Acad. Nat. Sci., Apr., 1SC4, p. 112. Obs., xi, 

 87, t. 23, f. 33. 



Description. — Shell smooth, or obscurely folded, somewhat fusiform, 

 somewhat thick, yellow, four-banded ^ spire conical ; Fig. 504. Fig. 505. 

 sutures regularly impressed; whorls about eight, 

 flattened, angular towards the. apex ; aperture rather 

 large, ovate and four-banded within ; outer lip acute 

 and somewhat sinuous ; columella thin and some- 

 what twisted. 



Operculum ovate, rather thin, light brown, with the polar point 

 near the left edge. 



Habitat. — Coosa and Cahawba Elvers, Alabama; Di-. Showalter: 

 East Tennessee and North Georgia; Bishop Elliott. 



Diameter, -37 ; length, -'JS of an inch. 



