258 NEW MELANIDiE OF THE UNITED STATES. 



Hal.— Coosa River, Alabama, E. R. Showalier, M. D. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. -34, Length -55 inch. 



Remarks. — This species is more nearly allied to tintinnabulum (nobis) than 

 any other. It differs in being more elongate, having a higher spire, having a 

 less dilate aperture, and in usually having four bands, the tinlinnabulum usually 

 having two bands, or being without any. In two of the Goosaensis, out of six 

 specimens before me, the bands are interrupted, changing them to rows of square 

 inaculations. Some of the specimens are slightly umbilicate. The aperture is 

 rather more than half the length of the shell. 



Anculosa contorta. PL 35, fig. 66. 



Testa lsevi, globoso-ovoidea, crassa, luteo-cornea ; spira elevata ; suturis valcle impressis ; anfractibus inflatis, 

 obsolete transverse striatis ; apertura parva, subrotunda, contracta, intus luteo-alba ; columella, in- 

 crassata ; labro acuto, expanso. 



Shell smooth, ovately rounded, thick, yellowish horn-color ; spire raised ; sutures 

 deeply impressed ; whorls inflated, obscurely and transversely striate ; aperture 

 small, nearly round, constricted, yellowish white within ; columella thickened ; 

 outer lip acute and expanded. 



Anculosa contorta, Proc. Acad. Nat. Sci. 1860, p. 187. 



Hob.— Coosa River, at Wetumpka, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter. ' 

 Diam. -36, Length -50 inch. 



Remarks. — A single specimen only was received from Dr. Showalter, which, 

 being much eroded at the apex, prevents a perfect description being made. But 

 the number of whorls appear to be about four. The form is remarkable for an 

 Anculosa, the outline presenting the appearance of a Paludina; but the callus on 

 the columella and its whole massiveness, forbid its being placed in that genus, 

 while the regular rotundity of the whorls are similar in some measure to it. The 

 aperture is about half the length of the shell. 



Genus LITHASIA. 



LlTHASIA IMPERIALIS. PI. 35, fig. 67. 



Testa, tuberculata, fusiforini, subcrassa, tenebroso-cornea ; spira elevata, conoidea; suturis irregulariter 

 et valde impressis ; anfractibus senis, ultimo subgrandi, superne irregulariter tuberculatis, sub- 

 inflatis; apertura parviuscula, elongato-rhomboidea, intus albida, fuscis capillaribus instructis, ad 

 basim canaliculate et recurvata ; columella sigmoidea, superne paulisper incrassatft ; labro subex- 

 panso, margine acuto. 



Shell tuberculate, fusiform, rather thick, dark horn-color ; spire raised, conoidal ; 

 sutures irregularly and much impressed ; whorls six, the last rather large, irregularly 



