220 NEW MELANIDiE OF THE UNITED STATES. 



CONIOBASIfi RARA. PI. 34, fig. 3. 



TestS, lasvi, elevato-conoidea, scalariformi, subcrassa, tenebroso-oliva, nitida ; spira elevata; suturis ir- 

 regulariter impressis ; anfractibus octonis, planulatis, supcrnc angulatis ; apertura parviuscula, ellip- 

 tic;!, intus tenebroso-purpurea ; labro-acuto ; columella incurva, purpurea, ad basim obtuse angulata. 



Shell smooth, high conical, scalariform, rather thick, dark olive, shining; spire 

 raised ; sutures irregularly impressed ; whorls eight, flattened, angular above ; aperture 

 rather small, elliptical, dark purple within ; outer lip sharp ; columella incurved, 

 purple, obtusely angular at the base. 



Melania vara, Proc. Acad. Nat. Sci., 1861, p. 12]. 



Hab. — Coosa River, Alabama. E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. -38, Length -90 inch. 



BemarJcs. — A single specimen only of this species was sent to me by Dr. Showalter. 

 It is remarkable for its fine polish, its dark color and its square shoulder below the 

 sutures. It has a few obscure stride on the lower part of the whorl. The Babylonic 

 form is unusual. It reminds one of varians, herein described, but that species is 

 plicate and not scalariform. The length of the aperture is more than one-third the 

 length of the shell. 



'.-i l 



Goniobasis Showalterii. PI. 34, fig. 4. 



Testa lasvi, elevato-conica, subcrassS, luteo-fusca, quadrivittata ; suturis impressis ; spira obtuse elevata ; 

 anfractibus instar senis, superne planulatis, inferne subinflatis, ultimo subgrandi; apertura subgrandi, 

 ovato-rhomboidea, intus albida et vittata ; labro acuto et paulisper sinuato; columella alba, inflecta, 

 supernci paulisper incrassata, ad basim subrotundata. * 



Shell smooth, raised conical, rather thick, yellowish brown, four bands ; spire ob- 

 tusely elevated ; sutures impressed ; whorls about six, flattened above, somewhat 

 inflated below, the last rather large ; aperture rather large, ovately rhombic ; whitish 

 and banded within ; outer lip sharp and slightly sinuate ; columella white, inflected, 

 slightly thickened above, rounded at the base. 



Operculum elongate, tongue-shaped, narrower at the outer end, dark brown, without 

 polar point, having parallel, transverse, slightly curved striae. 



Melania Showalterii, Proc. Acad. Nat. Sci., 1861, p. 120. 



Hab. — Coosa and Cahawba Rivers, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinets of Dr. Showalter and Dr. Lewis. 

 Diam. -42, Length — inch. 



Remarks. — This remarkable shell was sent to me by Dr. Showalter last summer, 

 calling my attention to the very unusual form of its horny operculum, which in the 

 old specimens is half an inch long, being a quarter of an inch wide at the inner end, 

 gradually diminishing to an angular point at the outer end. It is usually curved. 



