158 POTTS VILLE FAUNA OF OHIO 



has not yet been found elsewhere. The ovoid bodies are seen on the 

 inside of external molds of brachiopods and pelecypods, but in especial 

 abundance on the large Spirifer boonensis, which is the most char- 

 acteristic fossil from the locality. The minute filaments associated 

 and connected with the ovoid bodies are seen entirely within the ex- 

 ternal impression or on the external cast when only partially embedded. 

 Horizon and locality. McArthur limestone: Jackson County, 

 Monroe Furnace, Locality 80, aa. 



Genus Tabulipora Young 

 Tabulipora ohioensis (Foerste) 



1887 Stenopora ohioensis. Foerste, Bull. Den. Univ., Vol. 2, p. 85, PI. 7, Figs. 12 a-e. 

 Coal Measures: Flint Ridge, Ohio. 



Remarks. Tabulipora ohioensis occurs in the Boggs member, 

 where it is represented in the collections studied by only a few speci- 

 mens, and also in the Lower Mercer of Perry, Muskingum, and Licking 

 counties where it is more common and characteristic. 



Horizon and locality. Boggs limestone: Muskingum County, Lo- 

 cality 26, r. Lower Mercer limestone: Perry County, Locality 35, r; 

 Muskingum County, Locality 45, c; Licking County, Locality 47, c. 



Genus Chainodictyon Foerste 

 Chainodictyon laxum Foerste 



1887 Chainodictyon laxum. Foerste, Bull. Den. Univ., Vol. 2, pp. 81, 87, PI. 7, 



Figs. 8a-c. 



Coal Measures: Flint Ridge, Ohio; Seville, Illinois. 



1888 Chainodictyon laxum. Foerste, Bull. Den. Univ., Vol. 3, p. 135. 



Foerste's description.- "Meshes elongate, rhomboid, elliptical, 

 oval, ovate, and obovate in the same zoarium, typically elliptical, about 

 2.5 mm. long and 1.3 mm. wide. Branches narrow, about .3 to .38 mm. 

 wide; the cells are arranged in diagonal rows; longitudinally about 5 

 cells may be measured along the sides of the branches in a length of 

 2 mm. The cells arise near the nonporiferous side, are quite elongate, 

 and reach the surface at a very oblique angle. Longitudinal arrange- 

 ment of cells is incidental rather than typical and often obscured, 

 whereas the oblique series remain distinct." 



Remarks. This rare species is represented in the collections 

 studied by about a half-dozen specimens from the Lower Mercer lime- 

 stone of Muskingum and Licking counties which for the most part are a 

 little smaller than those which were regarded typical by. Foerste. 



