206 GASTEROPODS. 



Loxonema tenuilineatum (?HUMARD). 

 Chemnitzia tenuihneata Shnmard, 1855 : Geol. Sur. Missouri, Ann. Kept., 



p. 207, pi. C, fig. 12. 

 Loxonema tenuilineatum Miller, 1890: N. A. Geol. and Pal., p. 408. 



Shell rather large, broad ; volutions moderately convex ; 

 suture rather deeply impressed. Aperture subovate. Sur- 

 face marked by numerous very fine, vertical costse, which arch 

 gently backward ; crossing these are low obsolete revolving 

 ridges, of which there are from twelve to fifteen on the body- 

 whorl. 



Horizon and localities Lower Carboniferous, Chouteau 

 limestone: Ghouteau Springs (Cooper county). 



Loxonema multicosta MEFK & WORTHEN. 

 Loxonema multicosta Meek & Worthen, 1866 : Geol. Sur. Illinois, vol. II, 



p. 378, pi. xxxi, figs. 12a-c. 

 Lcxonema multicosta Keyes, 1891 : Proc. Acad. Nat. Sci., Phila., p. 260. 



Shell small, conical. Volutions about seven in number, 

 moderately convex, the last forming about one-third the entire 

 length; suture well defined; aperture rounded, subrhombic. 

 Surface marked by small, nearly straight vertical costse, which 

 number about thirty in the body-whorl. 



Horizon and localities. Upper Carboniferous, Upper Coal 

 Measures : Kansas City. 



Loxonema scitulum MEKK & WORTHEN. 

 Loxonema scitulum Meek & Worthen, 1860: Proc. Acad. Nat. Sci., Phila., 



p. 464. 

 Loxonema rugosum Meek & Worthen, 1860: Proc. Acad. Nat. Sci., Phila., 



p. 465. 

 Loxonema scitulum Meek & Worthen, 1<,66 : Geol. Sur. Illinois, vol. II, p. 



377, pi. xxxi, figs. lOa-c. 

 Loxonema rugosum Meek & Worthen, 1866: Geol. Sur. Illinois, vol. II, 



p. 378, pi. xxxi, figs, lla-c. 

 Loxonema scitulum Keyes, 1891 : Proc. Acad. Nat. Sci., Phila., p. 259. 



Shell very small, elongate, conical, rounded below ; volu- 

 tions about seven, slightly curved, increasing gradually in size ; 

 suture distinct, but slightly impressed. Aperture subovate, 

 rather sharply angular above. Surface marked by prominent 

 rounded folds, which taper at both ends to the sutures of the 

 respective whorls. These rounded ridges number from fifteen 



