3G4 LA.ND AXD FRESH-WATER SHELLS OF N. A. [PART IV. 



Operculum ovate, dark brown, with the polar point near to the 

 inner lower edge. 

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

 Diameter, -44; length, -78 of an inch. 



Observations. — This is rather a robust species, and judging from 

 the specimens before me, I should presume that there would be much 

 Fig. 687. I'egularity in the species. On one of the specimens there 

 are two obscure, hair-like bands, one on the middle of the 

 body-whorl and another near the base. Other specimens 

 have only a very obscure, thin band near the base. Ver}' 

 probably specimens may be found with a third band near 

 to the suture, and others with better defined bands. Some 

 were chestnut-brown. The upper whorls were rather flattened, and 

 the lines of growth few and obscure. The impression made by the 

 lip-cut is well defined, and forms a strong, narrow, hem-like line 

 below the suture. The outer lip stands close to the body-whorl. 

 The aperture is one-half the length of the shell, and the base is ob- 

 tusely angular. This species, in general facies, is near to glandula 

 herein described, but difi'ers in the form of the lip-cut, which is 

 narrow, deep and straight. It is also a much larger species, and 

 is without the well marked shoulder of glandula. — Lea. 



This pretty species appears to be allied to S. bulbosum, 

 Anthony, but offers the following points of distinction : — it 

 is more inflated and heavier, the color is much lighter, the 

 bands are very narrow and the striation is not so strongly 

 marked. In a very fine individual before me, the bod^^-whorl 

 is disposed to tuberculatiou below the suture. 



14. S. sphsericum, Anthony. 



Melatoma sphxericum, Axthony, MSS., Eeeve, Monog., sp.8, April, 18G1, 



Description. — Shell subglobose, yellowish-olive, encircled with in- 

 terrupted fillets of greenish-black; spire small, somewhat immersed; 

 whorls convex, smooth, rather inflated; sutural fissure Fig. 688. 

 slightly channelled ; columella callous. 

 Habitat. — Coosa River, Alabama., 



Observations. — A small, globose shell, with its little 

 spire distinctly immersed, characterized by a copious banding through- 

 out of interrupted fillets of greenish-black, fuscous in the interior.— 

 Jieeve. 



