214 DiCTYOSPONOID.E. 



PLATE VIII. 

 HYDNOCERAS, Conrad. 



Page 95. 

 (Sm PUtee II, III, IV, V, VI, VII, IX, X.XI, XII, XXXIII, XXXVI, XXXVII, XXXVIII XXXIX, XLVI.) 



Hydnoceras tuberosum, Conrad. 



Page 97. 

 (Bee Plates II, III, IV, V, VI, VII, XXXVCII.) 



Figure 1. The basal extremity of a large individual, showing the very obscure 

 nodes and sharply defined prism-faces. 



Figure 2. A nearly entire individual with four well defined horizontal rows 

 of low and sharp nodes, and broad, gently and regularly expanded 

 apertural region bearing only two small nodes belonging to the 

 median vertical series. Near the apex of the specimen the prismatic 

 faces are more obscure than elsewhere. 

 Chemung group. Brown MU, near Coliocton, New Yorh. 



Hydnoceras sp. 



Page 111. 



Figure 3. An imperfect and irregular fragment representing a moderately 

 large undescribed species of this genus, from an liorizon where such 

 forms are of very rare occurrence. 

 Chemung group. Wellsville, New Yorh. 



Hydnoceras Bathense, sp. nov. 



Page 101. 

 (See Plates III and IX.) 



Figure 4. A nearly entire example, with four horizontal rows of strong 

 nodes ; showing the fine reticulation of the surface and the obsolescence 

 of the prismatic faces. 

 Chemung group. Jenhs qtiarry, Bath, Ncio York. 



Hydnoceras eutiieles, sp. nov. 



Page 105. 

 (See Plate XXXIII.) 



Figures 5, 6. Two fragments representing like parts of two individuals and 

 showing the broad form of the sponge and tlie narrow, extended 

 and drooping nodes. 

 Chemung group. Cotton hill, near Avoca, Nexv YorTc. 



