136 GASTEROPODS. 



lines on the upper side of the whorls, crossed by about twenty 

 longitudinal lines ; band bordered on each side by a sharp 

 ridge; lower half of whorls ornamented only by obscure revolv- 

 ing lines and lines of growth. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures: Kansas City. 



Pleurotomaria subscalaris MEEK & WORTHEN. 



Pleurotomaria subscalaris Meek & Worthen, 1860: Proc. Acad. Nat. Sci., 



Phila., p. 460. 

 Pleurotomaria subscalaris Meek & Worthen, 1866: Geol. Sur. Illinois, vol. 



II, p. 360, pi. xxviii,figs. lOa-b. 



Closely resembling P. tabulata, differing apparently chiefly 

 in the absence of the crenulated periphery. 



Horizon and localities. Upper Carboniferous, Upper 

 Coal Measures : Kansas City. 



Meek & Worthen's type specimen was considerably water- 

 worn or eroded, and consequently the apical parts and the 

 sharp peripheral edge is rounded somewhat. The form may be, 

 therefore, an old individual of P. tabulata, with the sharp out- 

 lines and crenulations obliterated. 



Pleurotomaria missouriensis (SWALLOW). 



Plate xlviii, tig. 3a-b. 



Trochus missout it nsis Swallow, 1860: Trans. St. Louis Acad. Scl., vol. I, 



p. 657. 

 Pleurotomaria missouriensis Miller, 1877 : Cat. Am. Pal. Foss., p. 159. 



Shell very large, trochiform, with highly ornamented sur- 

 face. 



Horizon and localities. Upper Carboniferous, Upper 

 Coal Measures : Kansas City. 



Pleurotomaria coxana MEKK & WORTHEN. 



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



Phila., p. 272. 

 Pleurotomaria coxana Meek & Worthen, 1873: Geol. Sur. Illinois, vol. V, 



p. 600, pi. xxviii, figs. 15a-b. 



Shell very large, obliquely conical, much longer than wide ; 

 spire occupying over half the length. Whorls about seven in 

 number, obtusely angular at the periphery, obliquely flattened 



