Explanations of Plateh. Ji^l 



PIIYSOSPONGIA, IlalL 



Page 187. 

 (See Plates LVI, LXIl an<l LXIII.) 



PlIYSOSPONGIA MULTIBURSARIA, Sp. DOV. 

 Page 196. 



Figure 7. A portion of a frond which is a flat, undefined expansion showing 

 a finely reticulate surface. The vertical areas lying between the 

 principal spicular bands are more or less completely covered by 

 pendulous, overlapping nodes in the form of internal casts without 

 much evidence of reticulation. No other example of this species 

 has been observed. 

 Keokuk group. Crawfordsville, Indiana. 



