70 POTTSVILLE FAUNA OF OHIO 



Leda meekana Mark 



Leda prolongata n. sp. 



Yoldia stevensoni Meek 



Parallelodon carbonarius (Cox) 



Parallelodon tenuistriatus (Meek and Worthen) 



Pteria ohioense (Herrick) 



Myalina pernaformis Cox 



Schizodus affinis Herrick 



Aviculopecten coxanus Meek and Worthen 



Aviculopecten herzeri Meek 



Aviculopecten sorer Herrick 



Deltopecten occidentalis (Shumard) 



Acanthopecten carboniferous (Stevens) 



Crenipecten foerstii Herrick 



Euchondria neglecta (Geinitz) 



Entolium attenuatum Herrick 



Entolium aviculatus (Swallow) 



Lima retifera Shumard 



Allerisma terminale Hall 



Pleurophorella costata (Meek and Worthen) 



Pleurophorella geinitzi (Meek) 



Pleurophorus immaturus Herrick 



Pleurophorus tropidophorus Meek 



Astartella concentrica (Conrad) 



Astartella newberryi Meek 



Astartella varica McChesney 



Plagioglypta prosseri n. sp. 



Pharkidonotus percarinatus (Conrad) 



Patellostium montfortianum (Norwood and Pratten) 



Euphemus carbonarius (Cox) 



Euphemus nodocarinatus (Hall) 



Naticopsis nanus (Meek and Worthen) 



Schizostoma catilloides (Conrad) 



Zygopleura plenum (Herrick) ? 



Spbaerodoma fusiformis (Hall) ? 



Pseudorthoceras knoxense (McChesney) 

 Phillipsia trinucleata Herrick 



Licking County. The Lower Mercer member extends westward in 

 Licking County, where at its extreme limit it is found on the top of 

 Bald Knob, one of the highest hills of that vicinity, located about two 

 miles southeast of Newark. The limestone is thus described by Miss 

 Mark in her report on the Mercer limestone in the Newark-Zanesville 

 region: 1 "The top of the hill is covered with broken blocks of dark 

 blue, very fossiliferous limestone which weathers into somewhat shaly 

 fragments. None of the limestone is in place, and the heaviest block 

 measured eight inches in thickness. A small proportion of these frag- 

 ments are less shaly and when weathered are buff in color and much 



'Mark, C. G., Bull. Den. Univ., Vol. XVI, p. 271, 1911. 



