272  I)urrYOspoN(iii>.i-:. 



PLATE XXXVII. 

 IIYDNOCERAS, Conrad. 



Page 95. 

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



Hydnoceras bhopalum, sp. nov. 



Page 107. 



Figures 1, 2. Opposite sides of a very slender, somewhat malformed sj^ecimen 

 with faint indications of nodes over the lower half of the surface. 

 The mode of growth here exhibited and the general aspect of the 

 sponge is (piite distinct from that of 11. tuherosum, in association 

 with which this sjiecimen ^vas found. 

 Chemung group. Brown, Jiill colony, near Cohodon, New Yoi'h. 



Hydnocekas phymatodes, sp. nov. 



Page 104. 

 (See Plate VI.) 



Figure 3. A small nearly entire specimen with five well defined horizontal 

 rows of rather low nodes and two faintly developed additional rows, 

 one at the base and one at the aperture. 

 Lower Chemung. Italy, Yates county, New Yoi'h. 



Hydnoceuas variabile, sp. nov. 



Page 108. 

 (See Plate XXXVI ) 



Figures 4, 6. Opposite sides of a specimen preserving the apertural portion 



of the sponge and showing the indistinct nodes and irregular form 



which characterize the species. 

 Figure 5. Another specimen showing similar characters and the coarse 



reticulation of the cast. 



Lower Chemung. Deyo basin, Naples, New Yorh. 



