384 The Ohio Journal of Science [Vol. XIX, No. 7, 



Locality and Position : In the Holophragma zone of the 

 upper or Lilley member at the Zink or Corporation quarry, 

 within the eastern Hmits of Hillsboro, Ohio. Named in honor 

 of Prof. Charles S. Prosser, who made a special study of the 

 Hillsboro section. 



Remarks: In general appearance this species most nearly 

 resembles Poleumita cremilata (Whiteaves), from the Guelph 

 of Canada and New York. It differs greatly, however, in its 

 much more depressed spire. Compared with such species as 

 Poleumita durhamensis (Whiteaves), the revolving ridges are 

 much less prominent. 



Poleumita paveyi Sp. nov. 

 Plate XVII, Figs. 9 A-C. 



Spire low, but with the apex rising distinctly above the level of the 

 outer whorl; in the largest specimen at hand, about 22 mm. in diameter, 

 the apex of the spire rises at least 4 mm. above the outer whorl. Whorls 

 five or six; the convexity of the outer or body whorl is more or less 

 obliquely depressed; the convexity of the lower side of the body whorl 

 is moderate; and the umbilicus is relatively shallow. Between the 

 upper suture of the body whorl and its periphery there are 11 or 12 

 rather strong revolving ridges, equally spaced. Below the peripheral 

 line there are about 6 additional revolving ridges, the inner of which 

 bounds the comparatively smooth umbilicus. In the larger specimen, 

 here described, the revolving ridges are slighth' less than half a millimeter 

 in width and are slightly more than half a millimeter apart. The 

 revolving ridges are crossed by conspicuous transverse stria, of which 

 5 or 6 occur in a length of two millimeters, toward the aperture of the 

 body whorl. Where the transverse strise cross the revolving ridges 

 they are bent conspicuously backward. 



Locality and Position: In the Holophragma zone, at the 

 top of the upper or Lilley member of the West Union formation, 

 at the Zink or Corporation quarry, within the eastern limits of 

 Hillsboro, Ohio. Named in honor of Henry Pavey, who was 

 much interested in the geology of the area surrounding Hillsboro. 



Remarks: Compared with Poleumita scamnata Clarke and 

 Ruedemann, from the Guelph of New York, both the revolving 

 ridges and the transverse striae are coarser. In Poleumita 

 huntingtonensis Kindle and Breger the spire is much higher and 

 there is nothing known of the transverse striae. In Poleumita 

 plana Kindle and Breger the revolving ridges are less numerous, 

 are more widely spaced and the top of the spire is more -flat- 

 tened, being actually depressed in some specimens. 



