GASTROPODA— PLEUROTOMARIIDJE. 



639 



XXXIV. Worthenia DeKoninck. 

 Conical, with whorls embracing part way to angulation, which 

 is pronounced and carries the slit. This extends back one third 

 or one fourth the length of the whorl ; band regularly nodulated 

 or crenulated ; spirals well developed. Carbonic. 

 114. W. tabulata (Conr.). (Fig. 868.) Carbonic. 



Fig. 868. Worthenia tabulata. (After White, 13th Tnd. Rep.) 



Large, exposed part of whorl below carina equalling width of 

 shoulder, and like it flat or slightly concave. Nodulated band 

 prominent ; spirals more subdued. A second carina on body 

 whorl at level of suture. 



Coal measures of Pennsylvania, Indiana, Illinois, Missouri, and 

 Texas. Also in Belgium. 





*#m 



Fig. 869. Worthenia subscalaris, opposite views. (After Meek and Worthen, 



111. Pal., II.) 



