Report of the State, Geologist, 101 



Odontopleuea, Emmrich, 1839. 



0. Trentonensis, Hall (sp.), 1847. 



0. parvula, Walcott (sp.), 1877. 



0. Halli, Shumard (sp.), 1855. 



0. crossota (Locke ? ), Meek (sp.), 1873. 



0. O'Nealli Miller (sp.), 1875. 



0. Ortoni, Foerste (sp.), 1887. 



0. callicera, Hall (sp.), 1888. 

 DiORANURus, Conrad, 1841. 



D. hamatus, Conrad, 1841. 

 Ancyropyge, Clarke, 1891. 



A. Romingeri, Hall (sp.), 1888. 

 Species unclassified: 

 ? Geratocephala ceralepta, Anthony, 1873. 

 G. Gincinnatiensis, Meek (sp.), 1873. 

 G. Horani, Billings (sp.), 1857. 

 G.fimbriata, Hall (sp.), 1879. 



