DlCTYOSPONGID.E. 



369 



devoid of the ornamental nodes and ridges occuring in Pliragmodictya catilli- 

 formis. The specimen was described as having an oblique, 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. 



ACIXEODICTYA, gen. nov. 



1882. Pliragmodictya, Hall. Notes on the Family Dictyospongida? ; Expl. 

 pi 19, fig. 1. 



1884. Ectenodictya, Hall. Thirty-fifth Ann. Rept. N. Y. State Mus. Nat. 

 Hist., p. 476. 



Subcylindrical sponges with strongly fenestrated exterior, as in Clatiiro- 

 spongia, and with abruptly obconical base, as in Phragmodk tya. There is 

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



Figure 31. Large hexactln or pen tact in of Achrcnctya manipus, xiOO. (J. M. C.) 



spicular 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, Acloeodictya marsipus, sp. nov. 

 23 



