432 



E-EPOET OF TILE SlATE GEOLOGIST. 



PLATE LXVIII. 



PHEAGMODICTYA, Hall. 



Page 364. 



(See Plates LXIV, LXV, LXVI, LXVII.) 



Pheagmodictya catillifoemis, Whitfield (sp.). 



Page 365. 



(See Plates LXIV, LXV, LXVI, LXVII.) 



Figure 1. An average individual retaining the skeleton from the basal disc 

 upward ami preserving the usual configuration of the surface. 



Figure 2. A small specimen, exposing the basal disc and part of the periloph. 



Figure 3. A portion of a moderately large example showing the disc and the 

 strong vertical surface ridges. 



Figure 4. The concave or lower surface of the basal disc with the broad 

 periloph attached. 



Keokuk group. Crawfordsville, Indiana. 



(?) Pheagmodictya lineata, Hall. 



Page 368. 



Figure 5. The original specimen, which is a fragment of a smooth, slender 

 subcylindrical cup, somewhat expanded about the lower end. It is 

 probably not a species of Pheagmodictya. 

 Keokuk group. Crawfordsville, Indiana. 



CALATHOSPONGIA, gen. nov. 



Page 347. 



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



Calatiiospongia amphoeina, sp. nov. 



Page 374. 



Figure 6. A specimen with the flaring upper portion somewhat deflected but 

 showing the general aspect of the sponge. The surface is smooth 

 and the reticulum fine with prominent vertical spicular bundles. 

 Keokuk group. Orawfordaville, Indiana. 



