226 LAND AXD FRESII-WATER SHELLS OF N. A. [PART IV. 



Opercuhim ovate, thin, brown, with the polar point near to the base 

 ou the left margin. 



Habitat. — Spartanburg District, South Carolina ; Trof. L. Vanuxem : 

 Marietta, Ohio ; Dr. Hildreth : "Wabash River, Ind. ; II. C. Grosveuor. 



Diameter, -23 ; length, -54 of an inch. 



Observations. — I have seven specimens from Spartanburg, seven 

 from Marietta and two from the Wabash. This small, graceful spe- 

 cies has a wide, geographical distribution. I can see very lit- 

 Fig. 448. . fc> fe 1 



tie difference between the specimens of the different habitats. 

 The two from the Wabash are very much smaller and thinner, 

 and may be much younger, but they differ in having a purplish 

 columella which is not observable in the others. One of them 

 has a remarkable row of brown spots under the sutures on the body- 

 whorl. The other is without spots or bands. Usually this species 

 has two bands ; six of the seven from Marietta are two-bauded. Of 

 the seven from Spartanburg two only are double-banded. The others 

 are without bands. The species is very nearly allied to Melania {Gon- 

 iobasis) ovoidea (nobis), but it is more elongate and the aperture is 

 less effuse. The aperture is not quite half the length of the shell. — 

 Lea. 



I fear the specimens mentioned as from Mcarietta, Ohio, and 

 Wabash River, Ind., are not distinct from depygis.^ Say. 



116. G. Gerhardtii, Lea. 



Goniobasis Gerhardtii, Lea, Proc. Acad. Kat. Sci., p. 270, 1SG2. .Touru. Acad. 



Nat. Sc-1., V, i)t. :{, p. ."30, t. 38, f. 187, March, 18i;:i. Obs., ix, p. 152. 

 Goniobasis ivfuscata, Lea, Proc. Acad. Nat. Sci., p. 270, ]8:;'2. Journ. Acad. 



Nat. Sci., V, pt. 3, p. 330, t. 38, f. 188, March, 18G3. Obs. ix, p. l.)2. 



Description. — Shell carinate, fusiform, thin, shining, yellowish-green, 

 four-banded ; spire regularly conical ; apertui'e small, rhomboidal, 

 whitish and banded within; outer lip acute, slightly sinuous; colu- 

 mella bent in, slightly thickened below. 



Operculum ovate, thin, dark broAvn, with the polar point on the left 

 above the base. 



Habitat. — Chattanooga River, Georgia ; Alexander Gcrhardt ; Coosa 

 River, Alabama; Dr. Spillman. 



Diameter, '30; length, -72 of an inch. 



Observations. — From the two habitats I have a number of speci- 

 mens, nearly all of which arc young. The largest, one of which will 



