Orthis. 



520 



1888. — 869-7, -8 (small dorsal and ventral valves), from Le- 

 Boeuf quarry, Erie Co. Pa. on outcrop of Panama conglom- 

 erate^ VIII g, — 872-14, -20 (cast, ventral valve), -21 (four 

 casts of interior of ventral valve and impression of exterior), 

 -485 (two casts), all in Coll. from Nichols, Tioga Co., N. Y. 

 —882-6, fromKinzua Creek, McKean Co.— 883-32, -61 I (cast 

 of ventral valve), -80 c (cast), -82 &, -87 (cast of ventral 

 valve), -93, all in Coll. in Tioga Co., N. Y. — all the above from 

 Chemung formations VIII g^ 



Orthis insculpta, Hall, Pal. N. Y. Vol. 1, 1847. Trenton 





in New 

 York, 

 Cincin- 

 n a t i 

 grou p 



in Ohio) Emmons, Am. Geol. 



L ii, 195,pl. 9, fig. 12, a^ J, <?, (l\ fine radiating stride, forking once 

 near the beak, and again once or twice before reaching the edge 

 of the shell; crossed by strong concentric lines. — // c, Z/75, 

 Trenton and Cincin. formations. — Note. Emmons says that the 

 inside muscular scars are not those of an Orthis.— Qi^ol, Canada, 

 1863, page 167, figs. 150 a, I, Trenton formation, II c— Pal. 

 Ohio, Vol. 1, 1873, page 99, plate 9, fig. 1 a, h, dorsal, ventral 

 valves ; 1 ^, 6?, dorsal and ventral interiors ; 1 e^ another ven- 

 tral interior ; 1 /, ^, hinge and profile views ; 1 A, magnified 

 surface. — Cincinnati group ^ III 



Orthis interlineata. See Orthis tioga. VIII g, 



Orthis interstrialis. {Strophomena inter sir ialis.) See 

 Strophodonta cayuta. VIII g. 



