22 PROCEEDINGS OF THE ACADEMY OF [1897. 



expanded ; columella with an oblique fold above, the columellar 

 margin well dilated, rounded. Alt. 29, diam. 16 mill.; alt. of aper- 

 ture 14z mill. 



Peru. 



Closely allied to the preceding species, but the spire is more slen- 

 der, the umbilicus larger, surface less malleated and the columellar 

 fold more conspicuous. The apical riblets are finer and closer, less 

 coarsely granulated on the second whorl. 



Drymseus (Neopetraeus) filiola n. sp. 



Shell acutely oblong-ovate, solid and strong. Opaque, whitish, 

 distinctly flesb tinted at apex and last whorl, the spire bluish. Sur- 

 face shining, very irregularly striated, with scattered short trans- 

 verse impressions. Whorls, fully 6J, the first nearly planorboid 

 above, the second much higher than wide, producing a mamillar 

 apex with the characteristic sculpture of the subgenus. Following 

 whorls of spire flat, acutely keeled, the keel appearing just above 

 sutures, becoming more obtuse and concealed below ; next to last 

 whorl convex ; last whorl oblong, convex. 



Aperture irregularly ovate, purple-brown inside ; peristome blunt, 

 hardly expanded, pale edged ; columellar margin vertical and 

 straight, parietal wall flesh-colored, with no perceptible callus. Col- 

 umella very broad above, obliquely truncated in the middle, pro- 

 ducing the effect of a large blunt tooth. Umbilicus perforated, with 

 a compressed, long chink behind the inner lip. Length 45, diam. 

 25, alt of aperture 22"5 mill. 



Peru. 



The largest member of the Neopetraeus group, strikingly unlike 

 other species known to me in contour of shell and columella. The 

 specific name is in allusion to my own little daughter Elizabeth. 



