Explanations of Pf-atks. 203 



Figure 7. A somewhat restored aiul conventional figure of this species, 

 reproduced from the Thirty-fifth Annual lleport of the N. Y. State 

 Museum, pi. 17 (18), fig. 7. 



Hydnockras ANTiiRACia, sp. nov. 



Page 109. 

 (See Plates VI and XXXIII.) 



Figure 8. A fragment showing the upper portion of a small individual with 

 fine reticulation, broad apertural surface and four low subcircular 

 nodes, 

 Chemung group. Wellsville, New York. 



