208 DlCTYOSPONGin.E. 



PLATE V. 

 IIYDRIODICTYA, gen. nov. 



Page 77. 

 (See PUtee IV, XVI, XXI.) 



Hydriodictya cylix, sp. nov. 



Page 78. 

 (See Plate XVI.) 



Figures 1, 2. Opposite sides of a small, essentially entire specimen, showing 

 the character of the reticulation. The surface of the sponge is 

 smooth and the apparent swellings and depressions wholly due to 

 compression in fossilization. 

 Chemung group. Deyo basin, Naples, New Yorh. 



IIYDNOCERAS, Conrad. 



Page 95. 

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



Hydnocekas tuberosum, C'onrad. 



Page 97. 

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



Figui'e 8. A long, slender and nearly entire individual, bearing five horizontal 

 rows of nodes with an additional one near the base in an incipient 

 condition ; showing the smooth surface in the apertural region, the 

 regular aperture and the tufts at each node, which have been drawn 

 in from impressions left upon the matrix. 



Figure 4. A stouter, more sharply prismatic specimen with more extended 

 tufts, retaining also the vertical lamellae connecting them. The 

 cavities left by the bases of these tufts are shown at the summits of 

 some of the nodes. 

 Chemung group. Brawn hill, near CoJiocton, New Yorh. 



