248 DlCI'YOSPONGID^. 



PLATE XXV. 



THYSANODICTYA, gen. nov. 



Page 125. 

 (See Plates XIX, XXIII, XXIV, XXVI, XXVII, XXXVIII, XXXIX, XL, XLII, LIII.) 



Thysanodictya saccus, sp. nov. 



Pago 130. 



Figure 1. Lateral view of an entire individual shomng its rapidly tapering 



form and contracted aperture. 

 Figure 2. Basal view of the same specimen which has been compressed and 



shows an irregular reticulum with a somewhat nodose margin. 



Chemung group. Whitesville, Allegany county, ]^ew Yoi'k. 



CLATIIROSPONGIA, Hall. 



Page 121. 

 (See Plates XIV, XV, XVIII, XXI, XLIX, L.) 



ClATHROSPONGIA (J) DESMIA, Sp. UOV. 

 Page 125. 



Figure 3. A portion of the external surface of a species referred with doubt 

 to this genus ; showing the character of the primary quadrules. 

 Chemung group. Alfred, New Yorh. 



Clatiiuospongia vascellum, Hall (sp.). 



Page 123. 

 (See Plate XXI.) 



Figure 4. One side of a large, somewhat waterworn fragment, with very 

 large obscure primary quadrules and a distinct development of the 

 subordinate spicular bands. 

 Chemung group. Alfred, Neto YorK 



Clathrospongia fenestrata, Hall (sp.). 



Page 122. 

 (See Plato XIV.) 



Figure 5. An internal cast of a nearly entire cup. 



Chemung group. Chemung Narrwm, New YorTc. 



