DiCT. 



200 



Dictyophytonprismaticum (figs. 2, 3, 4 like D. conradi) : 



^ifM^y/^'^^^-:;:i»:Tm!!«ff~r!^t^i^'^. 



and D. tuberosum (fig. 7.) selected from a range of forms 

 given by Hall in the 35th An. Kt. N- Y. State Museum, 1884, 

 plate (17) 18, figs. 1 to 8, showing how all the forms of this 

 ancient sponge are naturally developed from Cyathophycus 

 reticulatiis of Walcott. — Abundant at many places in northern 

 Pennsylvania and southern N Y. in Chemung^ VIII g. 



Dictyophytum ramosum. Lesquereux. Additions and 

 Corrections to Coal Flora, 1884, page 827. Possibly a variety 

 of Dictyophyton tuberosum^ Hall, 16th An. Rt. 1863, page 90, 

 plate 3, fig. 1 ; none of the tubercles of which are prolonged as 

 branches; but Lesquereux's specimens have them so pro- 

 longed and inflated into half round knots at the apex. The 

 ribboning of the stems and branches are parallel and distinct. 

 Charleston, Tioga Co., Pa. VIII-IX, See Appendix. 



Dictyophptum redfieldi. Collected by Carll in Oil 

 Region. (C. E. Hall's Ms. Rt. Dec. 30, 1876)— FZ/7-7X 



Dictyophytum tuberosum (Hall). See D. ramosum. Col- 

 lected by Carll (C. E. Hall's Ms. Rt. 1876).— YIII-IX, 



Dictyophyta abound in F and H of Randall's section at 

 Warren, Pa., above and below the Sub-olean. — X XI 



