148 GASTEROPODS. 



Bellerophon sublaevis HALL. 



BellerophonsublcevisHB.ll, 1856: Trans. Albany Inst. , vol. IV, p. 32. 

 Bellerophon sublcevis Hall, 1858: Geology Iowa, vol. I, p. 666, pi. xxiii, 



figs. 15a-c. 

 Bellerophon sublcevis Whitfield, 1882: Bui. Am. Mus. Nat. Hist., vol. I, p. 



89, pi. viii, figs. 6-7. 

 Bellerophon sublcevis Hall, 1883: Geol. Sur. Indiana, Ann. Rep., p. 371, pi. 



xxxi, figs. 6-7. 

 Bellerophon sublcevis White, 1882 : Geol. Sur. Indiana, llth Ann. Rep., p. 



359, pi. xl, figs. 5-7. 



Shell rather small, globose, gradually and regularly ex- 

 panding to the aperture ; umbilicus closed. Aperture trans- 

 versely reniform, sinus moderately deep ; outer lip thin toward 

 the middle, greatly thickened at the sides ; inner lip but slightly 

 developed. Surface marked only by fine, even lines of growth. 



Horizon and localities Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



Bellerophon bellus SP. NOV. 



Plate 1, fig. 7. 



Shell subglobose, expanding rapidly at the aperture, which 

 is somewhat reniform, with the lip reflected at the sides. Sur- 

 face marked by a rather prominent, longitudinal carina along the 

 median portion of the shell ; strong transverse ridges parallel 

 to the lines of growth pass from one umbilical region to the 

 other ; these are crossed by less prominent longitudinal lines, 

 the two sets forming a beautiful cancellated area. 



Horizon and localities. Upper Carboniferous, Upper 

 Coal Measures : Kansas City. 



Bellerophon marcouanus GEINITZ. 



Plate li, fig. 3. 



Bellerophon marcouanus Geinitz, 1866: Garb, und Dyas in Nebraska, p. 



7, tab. i, fig. 12. 

 Bellerophon marcouanus Meek, 1872: U. S. Geol. Sur. Nebraska, p. 226, 



pi. iv, fig. 17; and pi. xi, figs. 13a-b. 



Shell much like B. montfortianus, with broadly expanded 

 aperture; but the numerous filiform, longitudinal ridges are 



