424 



Report of the State Geologist. 



PLATE LXIV. 



PHRAGMODICTYA, Hall. 



Page 364. 



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



Phragmodictya catillifoioiis, Whitfield (sp.). 



Page 365. 



(See Plates LXV, LXVI, LXVII, LXVIII ) 



Figure 1. A small specimen which lias been compressed vertically, disturb- 

 ing the form of the cup but showing the transverse basal plate. 



Figure 2. A view of the basal surface of the same specimen; showing the 

 radiating spicular bands. 



Figure 3. The basal extremity of a larger example to which the peripheral 

 frill or periloph is attached. This specimen shows the ridged and 

 crenulated surface of the frill, the eccentric apex of the base, and 

 retains a part of the vertical portion of the sponge though in a 

 compressed condition. 



Figure 4. An incomplete specimen, showing the approximate outline of the 

 entire sponge. This example has the surface ridges unusually strong 

 and regular and some of them are evidently continued on to the 

 periloph. The edge of the basal plate is very sharply denned. 



Figure 5. An imperfect but very large example, exposing the basal area, 

 a portion of the broad periloph and the vertical cup in a compressed 

 condition. The convergence of the radial spicular striae of the base 

 is very clearly defined. This is the original specimen of the species. 

 Keokuk group. Ora/wfordsville, Indiana. 



