212 DicrYosi'uNuiu>E. 



PLATE VII. 



HYDNOCERAS, Conrad. 



Pago 95. 

 (S«o Plates II, III, rV, V, VI, VIII, IX, X, XI, XII, XXXIII, XXXVI, XXXVII, XXXVIII, XXXIX, XL, VI.) 



Hydnoceeas hypastrum, sp. nov. 



Page 105. 



Figure 1. A transverse section viewed from beneath ; showing the circular 

 body of the species, and its strong, elongate pendant nodes arranged 

 in pairs elevated on stout bases. 



Chemung group. Middle or southern part of Steuben county, 

 New Yorh. 



Hydnoceras tuberosum, Conrad. 



Patfe 97. 

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



Figure 2. The basal portion of a small, nearly entire individual with Ioav 

 nodes and of irregular growth on one side ; showing the abrupt 

 appearance of an intercalary node near the top. 



Figure 3. An entire specimen in which the growth has been interrupted, 

 evidently by some accident, and the reticulum repaired, not how- 

 ever, without the disturbance and obliteration of most of the nodes. 

 There is no actual break or tear in the reticulum as might be inferred 

 from the appearance of the drawing near the top. 

 Chemung group. Brourn hill, near Cohocton, New YorJc. 



Hydnoceras tuberosum, Conrad, var. glossema, var. nov. 



Page 101. 

 (See Plate IX.) 



Figures 4, 5. Opposite sides of a nearly entire example, having a very 

 slender form and six horizontal rows of sharp nodes which have 

 been made to appear i-ather too broad at the lateral mai'gins. 

 Chemung group. Southwestern New Yorh {exact locality uncertaiti). 



