PLEUROCERA. 



107 



Fig. 203. 



Description. — Shell smooth, conical, rather thick, dark horn- 

 colored ; spire elevated ; sutures somewhat im- 

 pressed; "whorls flat; aperture small, whitish. 



Habitat. — Oconee District, Tennessee ; Dr. Troost. 



Diameter, -40; length, 1-22 inches. 



Observations. — This species has a regularly increas- 

 ing and elevated spire. Neither of the three before 

 me has perfect tip. The number of whorls must 

 be about ten. The aperture is about one-fourth the 

 length of the shell. — Lea. 



Apparently very closely related to pyrenella, 

 Conrad, but appears to be a heavier shell and not so strongly 

 angulated. 



The figure is a cop}' of that of Mr. Lea. 



52. P. validum, Anthony. 



Melania valida, Anthont, Proc. Acad. Nat. Sci., p. 59, Feb., 1800. Bintjey, Check 

 List, No. 282. BuOT, List, p. 33. Reeve, Monog. Melania, sp. 317. 



Description. — Shell ovate-conic, smooth, olivaceous, thick; spire 

 obtusely elevated, decollate ; whorls flat, only about six remaining ; 

 sutures distinct ; lines of growth very strong, amounting 

 to varices ou the body-whorl ; aperture ovate, bluish- white 

 within; columella strongly curved or indented about the 

 middle, wliite; sinus well developed at base; body-whorl 

 obscurely, concentrically striate, the stria3 forming faint 

 nodules where they intersect the varices. 

 Habitat. — Tennessee, 

 Observations. — This species may be compared with M. ten- 

 cZ>ro-cnic(« herein described ; from that species it may be distinguished 

 by its more robust form, uniform, dark, olivaceous color and the 

 absence of the dark bands so conspicuous in that species. It has a 

 very solid, compact form, and this with its regular, uniform size up to 

 the point of decollation, may serve to distinguish it from all others — 

 Anthotiy. 



Figure 204 is from Mr. Anthony's original type specimen. 



