406 



Report of the State Geologist. 



PLATE LV. 



PRISMODICTYA, gen. nov. 



Page 819, part 1. 



(See Plates XVII, XVIII, XIX, XX, XXI, XXVII, XXXIII, XXXIV, XXXV, XXXVI, XLI, XLII.) 



Peismodictya polyhedea, sp. nov. 



Page 360. 



Figures 1, 2. Opposite sides of the original, specimen. 



Keokuk group. In the shales at Craufordsville, Indiana. 



DICTYOSPONGIA, gen. nov. 



Page 812, part 1. 



(See Plates XIV, XV, XVI, XXVII, XXXIII, XXXVI, XXXVIII, XLI, XLII, XLIV, XLVI, LVI, LXI ) 



DlCTYOSPONGTA CYLINDEICA, Whitfield (sp.). 

 Page 358. 



Figure 3. View of the original specimen retaining the pyritized skeleton. 

 Keokuk group. Crawfordsville, Indiana. 



ACLCEODICTYA, gen. nov. 



Page 369. 

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



AcLOSODICTYA MAESIPUS, Sp. IIOV. 

 Page 370. 

 (See Plates LX, LXI, LXVIII.) 



Figure 4. Portion of the specimen with pyritized skeleton ; showing the 

 extent of one of the vertical lamellae of the outer wall of the 

 sponge. 



Keokuk group. Crawfordsville, Indiana. 



(?) Lykodictya, Hall. 

 Figure 5. Enlargement of a part of the surface of a young sponge which 

 probably belongs to a species of this genus ; showing the pyritized 

 spicular rods of two of the vertical bundles. The quadrules bear 

 faint traces of a fine reticulation. x3. 

 Keokuk group. Craicford.srille, Indiana. 



