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4. Leucochila hordacea, Gabb. 



Cylindrical, apex obtuse ; whorls 6, convex, with well im- 

 pressed suture, smooth, thin ; aperture small, edentulous ; lip 

 narrowly reflected and white ; base umbilicate, the umbilicus 

 bounded by an angle. 



Length 2*85 diam. I'l mill. 



Fort Grant, Arizona. 



5. Leucochila modica, Say. 



Plate 15, figure 14. 



Ovately conical, fragile, spire acute ; whorls 5, convex ; aper- 

 ture small, oval, lip turned over but not flattened, without teeth ; 

 imperforate. Pale horn color. 



Length 2-5, diam. 1'5 mill. 



Florida. 



6. Leucochila armifera, Say. 



Plate 15, figure 15. 



Subfusiform, smooth, apex obtuse ; whorls 6 to 7, with mode- 

 rately impressed sutures; aperture small, oval, with widely re- 

 flected lip, much thickened within, its extremities nearly joined, 

 connected by a callus deposit on the parietal margin ; teeth 

 generally four in number, namely, a parietal tooth, which is 

 lamellar, large, and has one or more projecting points or is 

 sometimes bifid, a rounded tooth on the left side, remote from 

 the margin, and two others on the outer lip near its base ; base 

 of shell keeled, umbilicus perforate. Light horn color. 



There are occasionally, in addition to the above, a distant 

 tooth in the base of the aperture, and a marginal one near the 

 top of the outer lip. 



Length 5, diam. 2-5 mill. 



Vermont to Kansas and southward to Kentucky. 



