332 LAKD AND FKESH-WATEU SHELLS OF N. A. [PAKT IV. 



Diameter, "44 ; length, "94 of an inch. 



Ohservations. — Several specimens were sent to me by Dr. Lewis 

 and by Dr. Showalter. It is a well marked species, and has some- 

 j,. ^„ what the appearance of a Schizostoma, but there is no fis- 

 sure. The shoulder below the suture is well marked and 

 like Schizostoma, and the suture so wide and deep as to 

 make quite a furrow. There is a disposition to have five 

 to eight coarse, rounded strise, with sulcations between, 

 but some specimens are nearly smooth. These coarse stria) 

 are cord- like and usually dark colored. The dark brown 

 bands are well defined within, and in each of the eight specimens 

 before me, there are four. On the upper part of the whorls the 

 bunds are interrupted with yellowish spots. The aperture is more 

 than one-third the length of the shell. I have great pleasure in dedi- 

 cating this interesting species to my friend, James Lewis, M.D. of 

 Mohawk, N. Y., who has done so much to develop the history of our 

 fresh- water Mollusks. — Lea. 



The young shell, like most of the species of this group, is 

 sharply angulated on the periphery. 



245, G. ellipsoides, Lka. 



Melanin gracilior,*'LEA, Proc. Acad. Nat. Sci., 1801, p. 118. 



Goniobasis ellipsoides, LEA, Jour. Acad. Nat. Sci., v, pt. 3, p. 234, t. 34, f. 31, March, 

 18G3. Obs., ix, p.5G. 



Description. — Shell striate, fusiform, greenish-yellow, rather thick; 

 spire rather elevated, conical ; sutures irregularly impressed ; whorls 

 seven, scarcely convex; aperture somewhat constricted, rig. 638. 

 elongately elliptical, whitish within ; outer lip acute ; colu- 

 mella whitish, a little recurved below, rounded at the base. 



Habitat. — Coosa River, Alabama; E. R. Showalter, M.D. 



Diameter, -43; length, -86 of an inch. 



Ohservations. — This species is very near in outline and 

 size to Coosacnsis herein described. It differs in being without bands 

 except obscure ones on the upper whorls, and in having but few raised 

 stria). Tlie channel at the base also difl'ers in ellipsoides being slightly 

 retuse. The color and whole aspect of the two specimens before me 

 are exactly alike, having a peculiar greenish-yellow epidei-mis. In 



* Changed to ellipsoides, the name of gracilior being preoccupied. 



