204 DicryospoNGiD^ 



PLATE HI. 

 HYDNOCERAS, Courad. 



Page %. 

 fSc.PUteill, IV, V, VI, VII, VIII, IX, X, XI, XII, XXXIII, XXXVI, XXXVII, XXXVIII, XXXIX, XLVI.) 



Hydnocebas tuberosum, Conrad. 



Pnee 97. 

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



Figure 1. The lower portion of a rather large individual in which the first 

 horizontal row of nodes has developed with regulai-ity, but the 

 second and third rows have been disordered by the appearance of 

 three nodes out of their normal position. It wil] be observed that 

 owing to this malformation and a defect in the net-work near the 

 center of the specimen, the vertical strands at the left of the drawing 

 become continuous with and form the horizontal strands on the more 

 remote node, lying next to the uppermost one on that side. This 

 peculiar structure is very clearly shown on the specimen. 



Figure 2. An incomplete specimen which has been somewhat compressed 

 vertically and the depth of the horizontal constrictions thereby 

 increased. The nodes have here, also, been somewhat irregular in 

 their appearance, one in the third row occurring out of its vertical 

 position, and its representative in the fourth row being omitted. 



Figure 4. End view of a large specimen having but seven nodes. 

 Chemung group. Brown hill, near Cohocton, New Yorh. 



Hydnoceras bathense, sp. nov. 



Page 101. 

 (See Plate* VIII and IX. ) 



Figure 3. An incomplete individual of average size, showing the prominent 

 nodes. 

 Chemung group. Jenhs quarry, Bath^ New York. 



