426 



Report of the State Geologist. 



PLATE LXV. 



PHRAGMOD1CTYA, Hall. 



Page 364. 



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



PlIRAGMODICTYA CATILLIFORMIS, Whitfield (sp.). 

 Page 365. 



(See PJates LXIV, LXVJ, LXVII, LXVIII.) 



Figure 1. The lower side of a large basal disc with the entire periloph 

 retained ; showing the line radial spicular striatums of the former 

 and the ridged surface and somewhat irregular margin of the latter. 



Figure 2. A natural half section of a basal disc with a highly elliptical form, 

 undoubtedly due to lateral compression. 

 • Keokuk group. Crawfordsville, Indiana. 



Phragmodictya patelliformis, Hall. 



Page 368. 



Figure 3. The lower surface of a large basal disc with a highly eccentric 

 apex. 



Keokuk group. From the sandy calcareous layers overlying the 

 calcareous shales, at Crawfordsville, Indiana. 



