2(54 DiCTYOSl'ONGIA. 



PLATE XXXIII. 

 DICTYSPONGIA, gen. nov. 



Page 72. 

 (Seo Plates XIV, XV, XVI, XXVII, XXXVI, XXXVIII, XLI, XLII, XLIV, XLVI, EV, LVI, LXI.) 



DiCTYOSPONGIA IIAPLEA, Sp IIOV. 

 Page 68. 



Figure 1. The larger and more complete of the specimens observed ; showing 

 the smooth non-prismatic surface and a contraction of diameter near 

 the aperture. 

 Portage gi-oup. JVajyles, New YovTc. 



PRISMODICTYA, gen. nov. 



Page 79. 

 (See Plates XVn, XVIII, XIX, XX, XXI. XXVII, XXXIV, XXXV, XXXVI, XLI, XLII, LV.) 



Pkismodictya pal^a, sp. nov. 



Pagp 69. 



Figure 2. The original specimen ; a nearly entire individual showing faint 

 prism-faces and indications of low horizontal depressions. 

 Portage group. Naples, Neto Yorh. 



HYDNOCEEAS, Conrad. 



Page 95. 

 (See Plates II, UI, IV, V, VI, VII, VIII, IX, X, XI, XII, XXXVI, XXXVII, XXXVIII, XXXIX, XLVL) 



Hydnoceuas gracile, sp. nov. 



Page 70. 



Figures 3, 4. Two specimens, entire in the extent of the cup from base to 

 apertui'e, but foreshortened by vertical compression. They show 

 three horizontal rows of nodes with traces of incipient nodes near 

 the aperture. 

 Portage group. Varyshurg, New Yorh 



Hydnoceras legatum, sp. nov. 



Page 69. 



Figure 5. A specimen of medium size ^vith apex preserved and bearing three 



horizontal rows of nodes. 



Portage group. Naples, New York 

 Figure 6. Fragment of a \'ery large example with broad nodes, similar to 



those in II. Avoca. 



Portage gi-oup. Varyshurg, New Yo7'h. 



