May, 1919] Silurian Fossils From Ohio 373 



No trace of the Bisher fauna has been found as yet north of 

 Port WilUam, at the northern margin of Chnton county, in 

 Ohio. Much higher strata occur at Leesburg, in the northern 

 part of Highland county, but none of the characteristic fossils 

 of the Lilley member have been identified at this locality, so 

 that, at present, the Lilley fauna appears of very limited 

 geographical extent. 



The faunas of the Niagaran strata of Highland and Adams 

 counties, in southern Ohio, have little in common with those of 

 the Niagaran strata of southern Indiana. On that account 

 any attempt at correlation is likely to prove of little value. 



The Bisher fauna contains Spirifer niagarensis and Bumastus 

 ioxus in the same form as in the Osgood formation of southern 

 Indiana, and the Whitfieldella cylindrica of the Bisher fauna 

 is represented in the Osgood fauna of southern Indiana by a 

 similar, though smaller form. In the Bisher exposure in the 

 quarry along the Beasley Fork road, in the southeastern part 

 of West Union, a single plate occurred containing the very 

 characteristic double pairs of pores found in Trematocystis 

 and other cystids incorrectly described by S. A. Miller from 

 Indiana as Holocystites. These few fossils are scarcely enough 

 to correlate the Bisher 'member of southern Ohio with the 

 Osgood formation of southern Indiana; however, this is the only 

 correlation which the present evidence seems to suggest. 

 Immediately overlying the argillaceous strata at the base of the 

 section on the creek east of Leesburg, in the northern part of 

 Highland county, occur Stephanocrinus gemmiformis and St. 

 hanimelli, the second of which is characteristic of the Osgood 

 formation in southern Indiana, but the precise correlation of 

 the Leesburg stratum containing these specimens of Stephano- 

 crinus with thos.e exposed in the Hillsboro section is still in 

 doubt. If they are of Bisher age, they would assist in cor- 

 relating the Bisher strata with those of Osgood age. 



In the fauna of the Lilley member, Cyathophyllum radiciila, 

 Omphyma cf. verrucosa, Stromhodes striatus, Cystiphyllum niaga- 

 rense, Plasmopora follis and Coenites verticellatiis suggest relation- 

 ship with the Louisville limestone of southern Indiana and the 

 adjacent part of Kentucky. Trochonema fatuum, from the 

 Racine of Wisconsin, is known also from the Guetph of New 

 York and the Louisville of Kentucky. Poleumita paveyi and 

 Poleumita prosseri are both related to Guelph species. Dal- 



