D ICTYOSPONGID.E. 



407 



GRIPHODICTYA, gen. nov. 



Page 371. 



GlilPIIODICTYA EPIPHANES, Sp. nOV. 

 Page 372. 



Figure 6. The specimen from which the spicules represented on page 372 

 were taken. This sponge has to some degree the aspect of 

 Phragiuodictya eatilh'formis, but its characteristic spicules have not 

 been found in any other species. 

 Keokuk group. OrawfordsviUe, Indiana. 



HYDRIODICTYA, gen. nov. 



Page 817, part 1. 

 (See Plates IV, V, XVI, XXI.) 



Hydriodictya cylix, sp. nov. 



Page 818, part 1. 

 (See Plates V and XVI.) 



Figure 7. An enlargement of a portion of the specimen given on Plate xvi, 

 fig. 2, show ing a part of the repaired net- work of the skeleton. 

 Chemung group. Deyo basin, Naples, N. Y. 



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