Explanations ok Plates. 



265 



Hydnockbas eutiieles, sp. IIOV. (?) 



Page 70. 

 (See Plate Vin.) 



Figure 7. A fragment with elongated, subpendiilous nodes, similar to those 

 snown in the figures of this species on Plate viii (figs 5 and 6). 

 Portage group. Varysbury, Neiv Yorh 



Hydnocebas antubacis, sp. nov. 



Page 109. 

 (See Plates II and VI.) 



Figures 8, 9. Opposite sides of the most complete example observed ; show- 

 ing the sharply prismatic anodate lower half of the sponge and the 

 three horizontal rows of low nodes of the upper half lying on, and 

 ridged by the pnsm-angles. 

 Chemung group. Scio, New Yoi'h. 



