Explanations of Platks. 



311 



CALATTIOSPONGIA, gen. nov. 



Page 155, 

 (See Plates XLVIII, XLIX, L, LI, LII, LVII, LX, LXVIIL) 



CaLATIIOSPONGIA (?) MAGNIFICA, Sp. nOV. 



Page 182. 



(See Plate LVII.) 



Figure .5. The expanded apertural portion of a large sponge showing sub- 

 prismatic faces. 

 Keokuk group. Ormjjfordsville, Iruliana. 



MASTODICTYA, gen nov. 



Pngo 167. 



DicTYOspoNGiA (Mastodictya) osculata, sp. nov. 



Page 167. 



Figure 6. A view of the specimen described ; showing the conical pro- 

 longation at the left, terminating in an osculum, the imperfect 

 portion at the right probably representing a similar process. The 

 reticulum is very fine, its meshes being of uniform size. 

 Keokuk group. Crawfordsville, Indiana, 



