278 DlClTfOSPONCilD^. 



PLATE XL, 



THYSANODICTYA, gen. nov. 



Page 125. 

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



Thysanodictya heemenia, sp. nov. 



Page 133. 

 (See Plates XXVII and XXXIX.) 



Figures 1, 2. Basal discs without the periloph but preserving more or less 



completely the coarser and finer reticulation. 

 Figure 3. Side view of a rather small specimen with the basal disc poorly 



retained. The sponge has been crushed toward the upper end and 



a part of its diameter with, doubtless, a considerable j)ortion of the 



length has been lost. 



Chemung group. Hinsdale, Cattarauyus county, New Yorh. 



