Speciks ok the Keokuk Group. 



177 



devoid of the ornamental nodes and ridges occuring in Phragniodictya catillir 

 formis. The specimen was described as having an obli(^ue, convex basal cone 

 with a strong eccentric cicatrix, but upon a reexamination this supposed 

 structure seems to be a portion of the lateral wall of the cup which has been 

 broken and somewhat irregularly compressed. The characters of this speci- 

 men are not retained with sufficient clearness to demonstrate its specific value. 



Locality. Keokuk group. In the calcareous shales at Crawfordsville, 

 Indiana. 



ACLCEODICTYA, gen. nov. 



1882. Phragmodictya, Hall. Notes on the Family Dictyospongidjp ; EzpL 

 pi. 19, fig. 1. 



1884. JEctenodlctya, Hall. Thirty-fifth Ann. Kept. N. Y. State Mus. Nat 

 Hist., p. 476. 



Subcylindrical sponges with strongly fenestrated exterior, as in Clathbo- 

 SPONGIA, and with abruptly obconical base, as in Phragmodictya. There is 

 no periloph as in the latter genus and in Tiiysanodictya, and the vertical 



FlOHEK SI. Large hexactln or pentactln of AclmOtctva mar><puj, i400. (J. M. C.) 



spiciilar bands converge irregularly to or about a broad apical point. The 

 radial bands from one side are continuous across the disc and are reticulated 

 by another set of radial bands from the other two quadrants of the disc. 

 Type, Adveodictya marsipus, sp. nov. 



