408 



Report of the State Geologist. 



PLATE LVI. 

 LYRODICTYA, Hall. 



Page 362. 

 (See Plates LIII and LV.) 



Lyrodictya Romingeri, Hall. 



Page 362. 



Figure 1. A view of the original specimen; showing the strong bundles of 

 rod-like, vertical spicules which are increased in number upward, by 

 intercalation, and also the finer reticulation over the broad inter- 

 spaces, in which the horizontal impressions predominate. 

 Keokuk group. Crawfordsvilfa, Indiana. 



DICTYOSPONGIA, gen. nov. 



Page 812, part 1. 



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



DlCTYOSPONGIA (?) STYLLNA Sp. BLOV. 

 Page 359. 



Figure 2. A long, slender, sponge-like body bearing horizontal and vertical 

 striae near the top. The true character of this fossil is not fully 

 determined but it is illustrated here on account of its resemblance to 

 forms of Dictyosponoia. 

 Keokuk group. Crawfordsville, India mi. 



PHYSOSPONGIA, Hall. 



Page 379. 

 (See Plates LXI, LXII, LXIII.) 



PlIYSOSPOXOIA, Sp. \ 



Figure 3. A portion of the upper part of a small example in which the 

 primary reticulating bundles of spicules are retained in a pyritized 

 condition, while the outer portions of the skeleton are lost. 



Figure 4. An enlargement of the same specimen to three diameters, showing 

 the square and regular quadrilles made by the intersecting bundles. 

 The specimen is interesting in showing that in youth the surface of 

 the sponge is without nodes or depressions, and it may be compared 

 with the similar condition exhibited by the senile stage show n in 

 figure 4, Plate lxiii. 



Keokuk group, Cra/wfoi'dsville, Indicma. 



