NEW MELANlDvE OF THE UNITED STATES. 263 



Sixteen, out of nineteen specimens before me, have very much the same character of 

 bands, viz : three broad, nearly equal distant revolving ones. The other three lose 

 all the yellowness of the epidermis, and present an intensely deep purplish brown hue 

 inside and out. The largest of these three has a more constricted aperture than any 

 of the others, and it has revolving strije more distinct towards the base, which I have 

 not observed in the others. The aperture is also quite channelled below, which is in- 

 distinct in the others. Another of these three dark specimens has a higher spire and 

 a shorter aperture, leaning towards the form of a Melania. The shoulder in many of 

 the specimens is large and well pronounced, while in others it is small. The aperture 

 is about two-thirds the length of the shell. This species reminds one as to its outline 

 of Melania undosa, Anth., from Kentucky. It is, however, larger, more cylindrical and 

 has the callus on the columella, which undosa, of course, has not. Undosa is also 

 much paler and has a higher spire. I have great pleasure in dedicating this species 

 to Dr. Showalter, who is doing so much for the Natural History of his adopted State. 



LlTHASIA NUCLEA. PI. 35, fig. 73. 



Testa laavi, elliptica, luteo-oliva, crassa, solida, trivittata ; spira obtuse conoidea j suturis impressis ; an- 

 fractibus quiuis, ultimo grandi et paruui inflato ; apertura parviuscula, ovato-rotunda, intus albida, 

 trivittata, ad basiru recurvata ; columella inferne et superne inerassata, incurva ; labro acuto. 



Shell smooth, elliptical, yellowish olive, thick, solid, three-banded ; spire obtuse- 

 conical; sutures impressed; whorls five, the last large and slightly inflated; aperture 

 rather small, ovately rounded, white and three-banded within, recurved at the base ; 

 columella thickened above and below, incurved ; outer lip sharp. 



Lithasia nucha, Proc. Acad. Nat. Sci., 1860, p. 188. 



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

 My cabinet and cabinet of Dr. Showalter. 



Diam - " 34 > Length -60 inch. 



Remarlcs.—l have nine specimens before me of this little species, which has much 

 the aspect of an Ancidosa, as well also of some Melaniw. But the callus on the lower 

 and upper parts of the columella naturally place it in Lithasia. The longest 

 of these specimens is not more than half an inch, and all are banded precisely alike, 

 the three bands being nearly of equal size and equidistant. It would appear then 

 that these bands are more constant than usual in the Melanidai. Four out of the 

 nine have a light purple spot on the middle of the columella, the others are entirely 

 white. Without being at all like Melania obovaia, Say, {consancjuinea, Anth.), in out- 

 line or general appearance, the columella is very much the same, both being thick 

 with an incipient channel at base. Indeed, M. obovata properly belongs to 

 the genus LitJiasia. In form, color and bands, nvclea reminds one of M. basalts (nobis), 

 but it is more rotund, has a thicker columella, has a less brilliant epidermis, and is a 



