BEEDE: UPPER PERMIAN RED BEDS. 165 



the outer portion of the whorl is nearly vertical or a little 

 concave, rounding off into the convex lower side. The suture 

 is well defined, so far as may be determined from the cast. 

 The umbilicus is rather wide, but from our specimens it can- 

 not be told whether it was closed or open. A cross-section of 

 the body whorl is subquadrate. The surface of the shell was 

 ornamented with six or seven revolving strise on the upper 

 side of the body volution, eight or nine around the periphery, 

 and probably a larger number of finer, more crowded ones on 

 the lower side. No indications of transverse striae or growth 

 marks are shown on our casts, though doubtless the shell had 

 fine lines of this character. Height, 6 mm. ; width, 9.5 mm. ; 

 height of body whorl, 4 mm. 



Whitehorse spring, Oklahoma ; rare. 



This species would seem to be very distantly related to 

 Pleurotomaria linkiana King, from the English Permian, so 

 far as form and surface features are concerned. Our species 

 has a more depressed spire and is more angular than that 

 species. It is much more closely related to Worthenopsis de- 

 jnciinensis Jakowlew, from Russia. 



WORTHENOPSIS sp. 



Plate VIII, figare 13. 



Shell very small, whorls five or more, sutures deep. The 

 whorls are compressed vertically, sharply angular, and bi- 

 carinate, a single carina showing on each whorl of the spire 

 about two-thirds the distance from the upper to the lower 

 suture. The whorls are vertically compressed, sharply an- 

 gular, with a concave band. The top of each succeeding 

 whorl is wound along the middle of the band, concealing the 

 carina on the lower side. On the body whorl the carina be- 

 low the band is less prominent than the one above it and is 

 less distant from the axis of the shell. Other characters un- 

 known. Height, 2 mm. ; width about 1.5 mm. 



Dozier, Tex. ; rare. 



This species may be distinguished at once by the angularity 

 of its whorls and the fact that only the upper keel shows on 

 the spire. 



