256 NEW MELANIDiE OF THE UNITED STATES. 



Hal. — Coosa River, Uniontown, Alabama, E. R. Showalter, M. D. 



My cabinet and cabinet of Dr. Showalter. 

 Diam. -37, Length -40 inch. 



Remarlcs. — Several specimens of this very remarkable Anculosa were sent to me 

 by Dr. Showalter. It differs from all the species I have seen in its peculiar large 

 ribs which girt it with great strength. The apices being eroded, the number of 

 whorls cannot be ascertained, but there are probably only three. On the second 

 whorl only three ribs appear above the suture. It reminds us at once of Palu- 

 domus loricata, Reeve, but the transverse ribs are not beaded like that shell. It is 

 also a diminutive shell compared with that, and has a more depressed spire. The 

 ribs are very large, and sometimes obscurely maculate. They are accompanied on 

 the inside with dark brown bands which terminate at the edge of the lip, each in a 

 small furrow, which produces the crenulations of the lip. 



Anculosa vittata. PL 35, fig. 63. 



Testa laevi, subglobosa, crassa, luteola, valde vittata ; spira obtusa ; suturis impressis ; aufractibus qua- 

 ternis, inflatis, ultimo grandi et ventricoso; apertura rotunda, in faucibus valde constricts, intus 

 vittata; columella valde" incrassata, planulata, purpurata; labro acuto, expanso. 



Shell smooth, subglobose, thick, yellowish, very much banded ; spire obtuse ; su- 

 tures impressed ; whorls four, inflated, the last large and very much inflated ; aper- 

 ture round, very much contracted in the throat, banded within; columella very 

 much thickened, flattened and purplish ; outer lip sharp and expanded. 



Anculosa vittata, Proc. Acad. Nat. Sci., 1860, p. 188. 



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



My cabinet and cabinet of Dr. Showalter. 

 Diam. -30, Length -33 inch. 



Remarks. — This is a very remarkable species, perhaps more like a much-banded 

 prcerosa, Say, than any other. It entirely differs from that species in the columella 

 being very thick and flattened, and which nearly fills up half the aperture. *The 

 banded varieties of prcerosa differ very much from each other, while this seems to be 

 exceedingly regular. The five specimens before me have each four dark brown bands 

 nearly covering up the yellow ground. The upper one is placed immediately under 

 the suture, and is broader than the two next, which are approximate, revolving on 

 the middle of the whorl. The fourth is larger again and revolves near to the base. 

 I have no doubt, judging from the five individuals before me, that the characters of 

 this little species will not be changeable, for they present no difference in phase 

 whatever, although they are of several ages. The aperture is about two-thirds the 

 length of the shell. 



