202 DictyospongidjE. 



PLATE II. 



HYDNOCERAS, Conrad. 



Page 95. 

 (See Plate. Ill, IV, V. VI, VH. VIII, IX. X, XI, XII, XXXIII, XXXVI, XXXVII, XXXVIII, XXXIX. XLVI ) 



Hydnoceras Avoca, sp. nov. 



Page 103. 

 (See Plates IX, X, XI.) 



Figure 1. Tlie upper portion of a large individual, an internal cast with veiy 

 sharply defined reticulation ; showing the broad, subcircular outline 



of the nodes. 



Chemung group. Avoca, Nero Yorh. 

 Figure 3. An incomplete and slender specimen with four horizontal rows of 

 nodes, three of these being greatly extended. 

 Chemung group. Jmks q^carry, Bath JVew Yorh. 



Hydnoceras kodostjm. Hall (sp.). 



Page 109. 



Figure 2. A view of a gutta-percha squeeze of the original impression; 

 showing the small size of the species and its prominent nodes in at 



least five rows. 



Chemung group. Cattaraugus county, New York 



Hydnoceras botrcedema, sp. nov. 



Page 102. 



Figure 4. A specimen of average size, showing the extended, flattened and 

 slightly drooping nodes, completely circular body and fine reticula- 

 tion. This species is almost invariably found in a highly imperfect 

 condition, and consequently, in this drawing the tips of the nodes 

 have been some\vhat restored from data furnished by several 



specimens. 



Chemung group. Irish Ml, near Bath, New Yorh. 



Hydnoceras tuberosum, Conrad. 



Piifte 97. 

 (See Plates III, IV, V, VI, VII, VIII, XXXVIII.) 



Figure 5. View from the upper end of an average internal cast. 

 Figure 6. An enlargement of the surface of the internal cast^ 



Chemung group. Broken hill, near Coliocton, New Yorh. 



