GONIOBASIS. 233 



Descnption. — Shell olivaceous, turreted, with eight or nine convex 

 whorls, separated by a deep suture; apex carinated anterior to the 

 middle of the whorls ; aperture ovate. 



Habitat. — Roanoke River, Virginia. 



Length, \ of an inch. 



Observations. — Less ponderous than the preceding species, 31. unci- 

 aUs, and distinguishd from M. Virginica by the carinated j-ig. 458. 

 apex. — Haldeman. 



This is a variable species inhabiting from Virginia 

 to Georgia, Alabama and Tennessee. In some local- 

 ities the carinjie of the body-whorl are better de- 

 veloped, and the color differs from light to dark 

 brown, which has caused the species -to be described several 

 times. The largest symmetrica I have seen attains to over 

 one inch. 



The following is the description of 



Melania imbricata. — Shell conical, nearly smooth, rather thick 

 light horn-colored ; spire elevated, but not acutely so ; whorls 8-9, 

 flat ; lines of growth distinct, having almost the appearance of ribs ; 

 two lines, distant, slightly visible, surround each whorl, and from 

 these the whorls incline towards each other to form a broad groove 

 between them ; sutures well impressed ; aperture small, nai'row, ovate, 

 within whitish ; columella much iudeuted and curved, forming a slight 

 sinus at base. 



Habitat. — Alabama. 



Diameter, -30 (8 millim.) ; length, -88 of an inch (23 millim.). 

 Length of aperture, -33 (8 millim.); breadth of aperture, -21 of an 

 inch (5 millim.). 



Observations. — A fine, symmetrical shell, some of its varieties ap- 

 proaching .V. sordida, Lea, in form, but dificring in every other 

 respect. The whorls enlarge regularly, and the lower raised line on 

 the whorls being consequently more prominent; the spire has some- 

 what an imbricated appearance, giving rise to its specific name. The 

 specimens before me, twelve in number, are all decollate. The upper 

 whorls are often rather prominently ribbed, and the concentric lines 

 thereby rendered crcnnloas.— Anthony. 



It is doubtful whether this species came from Alabama, as 

 stated above, or Georgia, as Mr. Anthony's specimens have 



