BULIMULUS. 



205 



There is a great difference in the comparative globoseuess of 

 the various specimens. 



The shell figured as a variety of B. schiedeanus with a dark 

 colored aperture in the fourth volume of the Terrestrial Mollusks 

 (pi. 80, f. 15) is rartier a specimen of Bid. aUernatus, in which 

 the columellar fold is not as strongly developed as usual. Fig. 8 

 of the same plate I describe below as variety mooreanus. 



Localitv. 



Tamauliiiits, Mex. 



Texas. 



Washington Co., Texas. 



Texas. 



Cienaga Grande. 



From whom received. 



G. Wurdemann. 

 W. G. Uiuuey. 



Fie. 353. 



BuUmuliis mooreanus. 



Fie. 354. 



Variety mooreanus. — Shell perforated, orate-coiiio, thin, white, 

 with a dark lead-colored apex, and below the middle of the body-whirl 

 of a light coffee color ; smooth, with micro- 

 scopic revolving lines : whirls seven, convex, 

 the last equalling about two-thirds the shell's 

 length; aperture ovate, light within, colu- 

 mella straight ; peristome acute, very thin, 

 with an internal delicate white rim, its 

 margins unconnected with callus, that of the 

 columella broad, white, slightly reflected. 

 Length 25, breadth 12 mill. 



Bulimus schiedeanus, var., W. G. Bixxey, 

 Terr. Moll. IV, 129, pi. Ixxx, f. 8. 



Found in large numbers in Washington and DeWitt 

 Counties, Texas, by Dr. F. W. Moore, and at Leon 

 by Lieut. Beale. 



It is a more fragile, highly 

 polished shell than B. schie- 

 deanus, and is peculiar in 

 having the dark apex and 

 the body-whirl light coffee- 

 colored below the upper 

 margin of the aperture. In one case 

 only have I observed the whole shell 

 of this color, it was then of a darker 

 Sidimuius mooreanus, v^v. ^iue. There is an extremely light, 

 transparent callus on the parietal wall of the aperture. 



Fig. 355. 



Bulitnulns 

 mooreanus. 



