56 POTTSVILLE FAUNA OF OHIO 



Acanthopecten carboniferous (Stevens) 

 Euchondria neglecta (Geinitz) 

 Entolium aviculatus (Swallow) 

 Lima retifera Shumard 

 Allerisma terminale Hall 

 Pleurophorus immaturus Herrick 

 Pleurophorus tropidophorus Meek 

 Astartella compacta Girty 

 Astartella concentrica (Conrad) 

 Astartella newberryi Meek 

 Astartella varica McChesney 

 Cypricardinia ? carbonaria Meek 



Plagioglypta prosseri n. sp. 



Bellerophon crassus Meek and Worthen 



Pharkidonotus percarinatus (Conrad) 



Pharkidonotus percarinatus var. tricarinatus (Shumard) 



Euphemus carbonarius (Cox) 



Euphemus nodocarinatus (Hall) 



Bucanopsis meekiana (Swallow) 



Patellostium montfortianum (Norwood and Pratten) 



Phanerotrema grayvillense (Norwood and Pratten) 



Schizostoma catilloides (Conrad) 



Naticopsis altonensis (McChesney) 



Zygopleura plenum (Herrick)? 



Zygopleura plicata (Whitfield) 



Bulimorpha inornata (Meek and Worthen)? 



Sphaerodoma brevis (White) 



Sphaerodoma fusiformis (Hall)? 



Sphaerodoma klipparti (Meek) 



Sphaerodoma newberryi (Stevens) 



Sphaerodoma primigenia (Conrad) 



Sphaerodoma regularis (Cox) 



Orthoceras isogramma Meek 

 Pseudorthoceras knoxense (McChesney) 



Phillipsia sangamonensis Meek and Worthen 



Muskingum County. The Lower Mercer member attains its maxi- 

 mum thickness in Licking and Muskingum counties. In Newton 

 Township in the latter county the limestone is in places replaced by 

 sandstone. Fossils were collected along a small tributary of Jonathan 

 Creek, in the northeastern part of Section 20, about one mile south of 

 White Cottage. Here the upper stratum of the member is a light, 

 bluish-gray shale which contains small brachiopod shells, Marginifera 

 muricata var. missouriensis Girty and M. wabashensis (Norwood and 

 Pratten) in extreme abundance. Below the shale there occur two 

 benches of hard, fossiliferous limestone. Collections were made from 

 both the hard limestone and the overlying shale. The geologic section 

 at this locality is given below (Locality 36) : 



