262 PALEONTOLOGY OF ILLINOIS. 



PAGE. 



STENOPTEEODUS, St. John and Worthen, 100 



planus, St. J. and W., Upper Burlington, 102 



sp. undet., Keokuk, 105 



elongatus, St. J. and W., Warsaw, - - 106 



parvulus, (N. and W. sp.), St. Louis, - 107 



CHITONODTJS, St. John and Worthen, - 



Springeri, St. J. and W., Upper Burlington, - 112 



antiquus, St. J. and W., Lower Burlington, - 116 



tribidis, St. J. and W., Keokuk, - 117 



liratus, St. J. and W., St. Louis, 119 

 COCHLIODUS, Agassiz, 



Van Hornii, St. J. and W., St. Louis, - - 120 

 obliquus, St. J. and W., St. Louis, - 126 

 Leidyi, St. J. and W., Chester, - 127 

 ? bialveatus, St. J. and W., Upper Burlington, 169 

 * Keokuk, St. J. and W., Keokuk, - - 169 



? convexus, St. J. and W., U. B. and Keokuk, 169 



TOMODUS, Agassiz, 



? limitaris, St. J. and W., Upper Burlington, 173 



XYSTRODUS, Agassiz, - 



simplex, St. J. and W., Upper Burlington, - 178 

 inconditiLs, St. J. and W., Keokuk, - - 179 

 imitatus, St. J. and W., St. Louis, 180 

 verus, St. J. and W., Chester, - 



bellulus, St. J. and W., Coal Measures, - 

 SANDALODUS, Newberry and Worthen, 



complanatus, (N. and W. sp.), Upper Burlington, - 



Icevissimus, N. and W., Keokuk, 



sp. ? Warsaw, 



spatulatus, N. and W., St. Louis, 

 ORTHOPLEURODUS, St. J. and W., 



carlonarius, (N. and W. sp.), Coal Measures, 



convexus, St. J. and W., Coal Measures, 



Novo Mexicanus, St. J. and W., Lower Garb., - 



, Agassiz, 



Varsoviensis, St. J. and W., Warsaw, 



St. Ludovici, St. J. and W., St. Louis, - 



Cestriensis, St. J. and W., Chester, - 



Wortheni, St. J., Chester, 



Springeri, St. J. and W., L. Carboniferous, 



carbonariu*, St. J. and W., Coal Measures, 



