306 DlCTYOSPONOID^.. 



PLATE LIV. 



ACLCEODICTYA, gen. nov. 



Page 177. 

 (See Plates LV, LX, LXI, LXVIII.) 



AcLfEODICTYA ECCKIfTRICA, Hall (sp.). 

 Page 179. 



Figure 1. A basal disc, somewhat compressed on one side but shoAving the 



continuity of the radial striae across the apical region, in two sets 



reticulating with each other. 

 Figure 2. A portion of a larger disc showing a tendency to the formation of 



elongate nodes or ridges near the periphery. 



Keokuk group. Crawfordnville, Indiana. 



(?) ECTENODICTYA, Hall. 



Page 164. 



(?) ECTENODICTYA IMPLEXA, Hall. 

 Page 164. 



Figure 3. A large irregularly enfolded frond which has been much weathered. 

 The net-work is very fine but is ci'ossed by stronger horizontal bands 

 like those in fig. 4, though these are much obscured in the specimen 

 and are not represented in the drawing. Enclosed in this specimen 

 is the original example of Clathrospongia abacus, figured upon 

 Plate xlix. 

 Waverly group. Warren, Pennsylvania. 



Figure 4. Another fragmentary sponge, showing the horizontal bands of the 

 reticulum. 



Waverly group. Oil City, Pennsylvania. 



Both of these specimens have a reticulum very similar to that 

 characterizing CalatJiospongia Redfieldi and C. GarUi, and it is 

 probable that such incomplete examples are to be referred to one or 

 the other of these species. 



