346 LAND AND KRESH-WATER SHELLS OF N. A. [pART IV. 



mens before me have more than three perfect whorls remaining, the 

 upper ones (perhaps six originall}') are worn off. The length of 

 the aperture is about one-half that of the shell. — Lea. 



7. E. nubila, Lea. 



Melanin nubila, Lea, Proc. Acad. Nat. Sci.. p. 118, ]8(!1. 



Goniobasis nubila, Lea, Jour. Acad. Nat. Sci., v, pt. 3, p. 2;5.), March, 1863. Obs., 

 ix, p. 57. 



Description. — Shell striate, somewhat elliptical, subfusiform, dark 

 green, obscurely spotted, rather thiclc; spire obtusely elevated; sut- 

 ures irregularly impressed; whorls six, rather inflated, the last large; 

 aperture rather large, rhomboido-elliptical, four-banded within; outer 

 lip acute ; columella arcuate, obtusely angular at the base. 

 Habitat. — Coosa River, Wetumpka, Alabama; Dr. E. R. Showalter. 

 Diameter, -45 of an inch; length, Tl leches. 



Observations. — Several specimens of different ages are before me. 

 The oldest one is about an inch long, tiie youngest about half an 

 Fig. 657. inch. They all bear the same dark nebulous character, but 

 the largest only has tiie four bands so wide as to combine 

 and give the fauces a dark purple hue, which extends to 

 the callus of the columella. The others have the columella 

 whitish and the bands are distinct within. The oldest has 

 a few coarse strice on the upper and lower parts of the 

 whorls, but the younger ones in my possession have not 

 these striae. There is a disposition in all these specimens to have 

 obscure coarse folds, which are yellowish, leaving between them 

 darkish spots. The aperture is nearly one-half the length of the 

 shell. — Lea. 



8. E. umbonatum, Lea. 



Eurycalon umbonatum, Lea, Proc. Acad. Nat. Sci., p. 3, 1864. Obs., xi, 106, t. 23, 

 f. 64. 



Description. — Shell nodulous, subfusiform, rather thick, obscurely 

 banded, dark olive ; spire very obtuse ; sutures very much impressed; 

 whorls with irregular bosses, swollen below the sutures, the last one 

 very large ; aperture very large, subelliptical ; outer lip acute, slightly 

 sinuous; columella thickened above and somewhat sinuous below. 



Habitat. — Smith's Shoals, Cumberland Eiver, East Tennessee ; 

 Majors. S. Lyou (U. S. E). 



