170 KANSAS UNIVERSITY SCIENCE BULLETIN. 



CAPULUS SELLARDSI, n. sp. 



Plate VII, figures 8-8/. 



Shell of moderate size, regular in outline, with pointed 

 beak. The beak is little elevated, has about half a turn, is 

 acute, and twisted somewhat to the right. Aperture longi- 

 tudinally ovate, edges regular, right side somewhat more 

 excavated than the left near the beak. Surface beautifully 

 ornamented with two sets of thread-like lines, the concentric 

 being more distantly spaced near the beak. On the right 

 lateral margin the radiating striae become much larger and 

 more distantly spaced and somewhat wavy. On the remain- 

 der of the shell the concentric lines are heavier. They are not 

 imbricated in the region of the beak. They are minutely 

 wavy on the front of the shell of some individuals. 



Whitehorse spring, Oklahoma ; common to abundant. 



STROPHOSTYLUS PERMIANUS, n. sp. 



Plate VIII, figures 2-2c. 



Naticopsis sp. Beede, Inv. Pal. Red Beds, p. 7, pi. 1, fig. 12, 1902. 



Shell moderately small, about three or four whorls visible 

 on the costa, showing, so far as observed, no tendency to 

 straighten out with age, as does S. remex (White). The 

 surface is marked with transverse lines of growth which are 

 unusually large for this genus and are pretty regularly 

 spaced. They are not very much stronger near the suture 

 than on the body of the whorl. Aperture elliptical. The 

 columella seems to be present, but its nature cannot be deter- 

 mined with certainty. "Height of spire, 7 mm.; greatest 

 diameter, 9 mm. ; height of body whorl, 6 mm." 



Whitehorse spring, Oklahoma ; abundant. Dozier, Tex. ; 

 rare to common. 



The shells of the Dozier specimens are somewhat smaller 

 than those from Whitehorse spring. The growth lines are 

 strong and sinuous, bending somewhat backward. 



This species is most closely related to S. remex (White), 

 but differs from it, apparently, in possessing no traces of re- 

 volving striae, in having the body volution more closely 

 coiled, and in attaining only half its size. 



