364 I'roccvdiitf/s of the Ohio State .icachviix of Science. 



less carinate, with distanl, sloiit, lalcrall}' compressed spines, 

 and with a row oi large apertures on either side of tlie carina. 

 Dissepiments nearly as large as the branches, in some cases 

 bent upward in the center, in others directed obliquely upward 

 from both sides of a Ijrancli, and in still others directed trans- 

 versely, and l)ear one to three ajiertures. h\Miestrules more or 





JFiG. 4. — Scptopora rcctistyla. 



a. — Inside of a frond, natural size, 

 lb. — Enlarged portion showing the apertures. (After \\'hitfield.) 



Hess variable and bordered, laterally, by apertures which, as a 

 rule, are three in number. The latter are less than their own 

 ■ diameter apart and have a prominent peristome. 



Reverse side not known. 



Horizon and locality. — • Maxville limestone. 

 Shale-nodidar zone : Kroft Bridge, White Cottage. 

 •Undetermined zone: Harper Shaft, Olive Furnace. 



FENESTELLA SERRATULA— Ulrich. 



1890. Feiiesfclla scrratula. Ulrich, Geol. Surv., 111., Vol. VIII, p. 544, 



pi. 50, figs. 5-5c. 

 Keokuk group : Nauvoo, Illinois. 



Warsaw beds: Monroe County and Warsaw, Illinois. 

 St. Louis limestone : Caldwell, Lyon, and Crittendon Counties, 



Kentucky. 



1894. Fenestella serratida. Keyes, Mo. Geol. Surv., Vol. V, p. 23. 

 Keokuk limestone : Keokuk, Iowa. 



