218 DlCTlOSPONULDJE. 



PLATE X. 



HYDNOCERAS, Conrad. 



Page 95. 

 (See Plates II. Ill, IV, V, VI, VII.VIII, IX, XI, XII, XXXIII, XXXVI, XXXVII, XXXVIII, XXXIX, XLVI.) 



Hydnoceras Avoca, sp. nov. 



Page 103. 

 (See Plates II, IX, XI.) 



Figure 1. A large, somewhat incomplete example with five horizontal rows 

 of fully developed nodes and an incipient row near the base. This 

 specimen shows the great size of the nodes, their semielliptical or 

 semicircular outline and the deep and narrow horizontal constrictions 

 by which they are separated. 

 Chemung group. Near Avoca, New York. 



