416 rrocccdiiHis of the Ohio Stati' .Icadcmy of Science. 



ORTHOCERAS OKAWENSE ?— Worthen. 



1883. Orthoceras Okira'cnsis. Worthen, Geol. Surv. J 11., Vol. VII, 

 p. 324. 

 Chester limestone : Okaw Bluffs near Red Bud, Randolph County, 

 Illinois. 

 1890. Orthoceras okawense. Worthen, Geol. Surv. Ill,, Vol. VI J I, p. 149, 

 pi. 26, fig. 3. 

 Chester limestone: Near Red Bud, Randolph County, Illinois. 



Description. — ''Shell elongate, slender, very gradually tap- 

 ering to the apex; septa concave, about fotir of them in the 

 space of one diameter. Siphimcle .sub-central ; .surface markings 

 unknown. 



''This shell has a general resemblance to O. nisheiise. Mc- 



FiG. 36.^ — Ortlwceras okazveiisel' A view of a fragment of a shell re- 

 ferred to this species. 



Chesney of the upper Coal Measures, but differs from it in the 

 position of the siphuncle which in our species is decidedly sub- 

 central [Worthen. 1890]."' 



Horizon and locality. — ]\Iaxville limestone. 

 Shale-nodular zone : Kroft Bridge, White Cottage. 



