196 PROCEEDINGS OF THE ACADEMY OF [May-Oct., 



Thysanophora textilis new species. Fig. 2. 



The shell is umbilicate, conoid, the height and diameter about 

 equal, pale brown. Sculpture of extremely low, subregularly spaced 

 longitudinal waves, over all a microscopic granulation produced by 

 the intersection of very minute striae and equally close spiral lines, 

 giving the appearance of a fine woven material. First 1| whorls 

 smooth. The whorls are \ery strongly convex. Suture very deeply 

 impressed. Aperture somewhat semilunar, oblique, outer Up thin 

 and simple, the columellar margin broadly dilated. 



Alt. 1.8, diam. 1.8 mm.; 4 whorls. 



Alt. 1.95, diam. 1.95 mm.; 4j whorls. 



Chama, Guatemala, A. A. Hinkley. 



The microscopic sculpture is somewhat like that of the apex of 

 Drymaeus, and unlike any Thysanophora I have examined. Whether 

 the species belongs to Thysanophora or to Pupisoma is an open 

 question, but the shape is rather more like the former. 



Fig. 2. — Thysanophora textilis. Fig. 3. — Helicina oaxacana. 



Helicina oaxacana new species. Fig, 3, 



The shell is a little wider than high, with conic spire and bluntly 

 carinate periphery, whitish, not glossy. Sculpture of fine growth- 

 striae and fine, indistinct, protractive wrinkles, visible in places only. 

 The whorls are rather strongly convex, the last having a blunt 

 median keel, convex above and at the base. The aperture is semi- 

 circular, oblique. Outer IId is moderately expanded. Columella 

 strongly concave on its ventral side, terminating in a projecting 

 tubercle. Callus small, a groove behind the columellar side. 



Alt. 4, diam. 4.5 mm.; 4f whorls. 



Pjerto Angel, Oaxaca, Mexico. C. R. Orcutt, 1910. Type No. 

 112,572, A. N. S. P. 



This species appears related to H. raresulcata of Vera Cruz, but 

 besides the somewhat diverse sculpture it differs by the angular 

 periphery. The same character differentiates it easily from other 

 small species of the region. 



