138 GA.STEROPODS. 



six of which occupy the area above the peripheral band, two 

 or three] the median flattened area, about twelve the under 

 side ; the peripheral band is also crenulated. These are crossed 

 by fine lines parallel to the striations of growth, every fourth 

 one of which is much stronger than the others. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Pleurotomaria coniformis WORTHEN. 



Pleurotomaria conoides Meek & Worthen, 1866: Proc. Acad. Nat. Sci., 



Phila., p. 217. 

 Pleurotomaria conoides Meek & Wortheo, 1873: Geol. Sur. Illinois, vol. V, 



p. 603, pi. xxviii, figa. la-c. 

 Pleurotomaria coniformis Worthen, 1882; Illinois St. Mua. Nat. Hist., 



Bui. 1, p. 38. 



Shell quite small, conical, somewhat higher than wide. 

 Whorls five in number, obliquely flattened parallel to the slope 

 of the spire, the lower margins projecting a little beyond the 

 upper edges of the succeeding volutions, angular at the peri- 

 phery, flattened below, and rapidly curving toward the center 

 into a small umbilicus. Aperture rhombic in outline; inner 

 margin nearly straight and parallel to the axis of the shell be- 

 low, abruptly turning outward at the base. Peripheral band 

 rather narrow, bordered on each side by a small sharp ridge, 

 which passes around thespire just above the suture. Surface 

 marked on the upper half of the whorls by small, oblique, 

 slightly curving lines, which on the lower side are less promi- 

 nent, and resemble lines of growth. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Pleurotomaria carbonaria NORWOOD & PRATTKN. 



Pleurotomaria carbonaria Norwood & Pratten, 1855: Jour. Acad. Nat. 



Sci., Phila., (2), vol. Ill, p. 75, pi. ix, fig. 8. 

 Pleurotomaria carbonaria Keyes, 1888: Proc. Acad. Nat. Sci., Phila., p. 



239. 

 Pleurotomaria carbonaria Keyes, 1891: Proc Acad. Nat. Sci., Phila., p. 



253. 

 Pleurotomaria harii Miller, 1891 : Geol. Sur. Indiana, 17th Ann. Kept., 



pi. xiv, figs. 3-4. 



