Orthis. 



532 



boniferous.) Tully limestone formation, VIII d, — In Colum- 

 bia Co;, Pa., between CatawJssa and Bloomsburg (Sect. 78, G7, 

 p. 287) it occurs in bed 71. (200' above the top of the Genesee), 

 in Chemung^ VIII g. 



Orthis resupinoides, Cox, Geo!. Sur. Ky., Vol. 3, 1857, 



v\ 



Cox. "^i^ Siir:^\t^KKKtKtKK% Vol3, PLIX. 



page 570, plate 9, tig. 1, cardinal view; 1 a. ventral valve; 1 5, 

 profile view. In roof shade of coal No. 11, at Hardesville, 

 Hancock Co., Ky. Uppe?' Coal measures. XV. 

 Orthis retroasaf Salter, Geol. Survey of Great Britain, 



1858. Pal. 

 Ohio, Vol. 1, 

 1873, page 92, 

 plate 11, figs. 

 7 a., dorsal 

 view; 7 5, 

 ventral, show- 

 ing the area 

 strongly i n 

 clined for 

 ward, and the 

 foramen with 

 beak and area 

 of dor sa] 



valve ; 7 c^ profile ; 7 rf, ventral interior, larger specimen, strong 

 muscular cavity, complex vascular markings ; 7 6, same smaller 

 specimen, with differences suggestive of another species; 7/*, 

 magnified surface. — Cincinnati group., Ill 



