116 



same county. It resembles the preceding very closely, but is de- 

 cidedly more slender, and like that shell it has two elevated lines 

 on the inferior margin of terminal whorls. The interior of the 

 aperture in many specimens is of a dull reddish color, and in some 

 the same part exhibits the appearance of two or three obsolete 

 bands. Another variety, which Mr. Yanuxem obtained from a 

 limestone spring near Broad river, Spartanburg district. South 

 Carolina, is of a pale horn color. In a stream of the Saluda range 

 of mountains near Mill Gap, in Rutherford county, he found 

 another variety of a somewhat smaller size, tinged with reddish- 

 brown, and generally distinctly banded within the aperture ; one 

 of these specimens is very remarkably truncated, presenting only 

 about one whorl and a quarter. The same variety also inhabits a 

 brook near the Table rock. A variety which seems to differ from 

 the latter only in size, was found by Mr. Vanuxem near Douthard's 

 Grap, of the Saluda mountains; the largest specimen he sent from 

 that locality is only about three-tenths of an inch long. 



Melania subglobosa. — Shell subglobose, brownish horn 

 color ; spire but little elevated, not half the length of the aperture ; 

 volutions about four ; aperture rounded, nearly as broad as long ; 

 within more or less tinged with dull red; labium a little flattened. 



Length three-fifths of an inch, greatest breadth eleven-twentieths 

 of an inch. 



Professor Vanuxem found this curious shell in the north fork of 

 the Holstein river, Virginia, where they are extremely abundant. 

 In the old shells the surface, and particularly that of the spire, is 

 considerably corroded, presenting the appearance of having re- 

 ceived a fortuitous deposition of calcareous matter. This corrosion, 

 however, does not extend to the destruction of any of the whorls, 

 as is the case with many shells, but its effects seem to be confined 

 to the exterior. It is a second species of my proposed genus An- 



OULOTUS. 



All the striae of the operculum are concentric to the superior 

 angle. 



PiRENA SCALARIFORMIS. — Shell turrctcd, gradually tapering to 

 the apex, which is acute; whorls rounded, crossed by numerous 

 elevated, regular lines, which, on the body whorl, are terminated 

 near the base by five or six more cr less profound revolving grooves; 

 .suture pretty deeply impressed, with generally one of the 



