142 GASTEROPODS. 



lines much more pronounced than others, and a more or less 

 regular alternation of the more prominent ones with the sec- 

 ondary raised striae; these are crossed by numerous regular 

 lines of growth, giving a more or less tuberculate character, 

 which is most conspicuous toward the suture. 



Horizon and localities. Upper Carboniferous, Lower Coal 

 Measures : Kansas City, Pleasant Hill ( Cass county ). 



Pleurotomaria tabulata (CONRAD). 



Turbo tabulata Conrad, 1835: Trans. Geol. Soc. Penn., vol. I, p. 267, 



pl.xii, fig. 1. 

 Pleurotomaria tabulata Conrad, 1842: Jour. Acad. Nat. Sci., Phila., vol. 



VIII, p. 272. 

 Pleurotomaria tabulata Hall, 1858: Geology Iowa, vol. I, p. 721, pi. xxix, 



figs. 12a-b. 

 Pleurotomaria tabulata White, 1884: Geol. Sur. Indiana, 13th Ann. Rep., 



pt. ii, p. 160, pi. xxxii, figs. 4, 5. 



Shell rather above medium size, subconical, with the spire 

 considerably elevated ; volutions eight in number, sharply 

 angular around the periphery, which is finely crenulated ; from 

 this prominent median carina, the outer surface is straight, or 

 slightly concave, to the suture above and below ; suture well 

 defined ; umbilicus closed ; columellar lip but slightly thick- 

 eneu. Aperture subcircular, flattened posteriorly, and quite 

 angular on each side ; outer lip distinctly notched. Surface 

 ornamented by numerous fine, revolving, very narrow ridges ; 

 these are crossed by lines of growth, which abruptly bend at 

 the peripheral angle. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Pleurotomaria brazoensis SHUMAKD. 



Plate xlviii, figs. 2a-b. 

 Pleurotomaria brazoensis Shumard, 1860: Trans. St. Louis Acad. Sci., 



vol. I, p. 624. 

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



p. 354, pl.xxviii, figs. la-d. 

 Pleurotomaria brazoensis Keyes,1888: Proc. Acbd. Nat. Sci., Phila., p. 



237. 



Shell rather small, trochiform ; spire occupying about one- 

 half the entire length. Whorls six in number, obliquely flat- 



