310 DicrYospoNoiD^ 



PLATE LVI. 

 LYRODICTYA, Hall. 



Page 170. 

 (See Plafeg LIII and LV.) 



Lyrodictya Rominoeri, Hall. 



Page 170. 



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. Cratvfordsville, Imliana. 



DICTYOSPONGIA, gen. nov. 



P»ge 72. 

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



DiCTYOSPONGIA (?) STYLINA Sp. UOV. 

 Page 167. 



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 DiCTYOSPONGIA. 



Keokuk group. Crmiifordmille, Indiana. 

 PHYSOSPONGIA, Hall. 



Page 187. 

 (See Plates LXI, LXII, LXIII.) 



Physospongia, sp. ? 



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

 primary reticulatiug 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 quadrules made by the intersecting l)undles. 

 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 shown in 

 figure 4, Plate Ixiii. 

 Keokuk group. Crawfordsville, Indiana. 



