Ozospongia johnstoni sp. nov. 

 (Page 185) 



Figure 1. A small single obcone of this species. 



Figure 2. A specimen showing a single branching cone from 

 the parent frond. 



Figure 3. The base of an obcone retaining a part of the stem or 

 pedicel. 



Hydnocerina armstrongi sp. nov. 



(Page 182) 



Figures 4 and 5. Opposite sides of the initial end of the indi- 

 vidual which shows the incipient development of the nodes upon the 

 rings. 



Chemung group, 8 miles east of Erie, Pa. 



[196] 



