402 



Report of the State Geologist. 



PLATE LIU. 



THAMNODICTYA, Hall. 



Page 352. 

 (See Plates L and LII.) 



Tiiamnodictya Ortoni, sp. nov. 



Page 354. 



Figures 1, 2. Opposite sides of a specimen which is an internal cast of the 

 expanded apertural portion of the sponge, the smooth lower point 

 representing the place of attachment of the pedicel. The species is 

 characterized by the fineness of the reticulation, the peculiar curva- 

 ture of the vertical bands and its large size. 

 Waverly group. Moots Run, Licking count//, Ohio. 



THYSANODICTYA, gen. nov. 



Page 865, part 1. 



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



TlIYSANODICTYA EXPANSA, Hall (sp.). 

 Page 346. 



Figure 3. A large basal disc or diaphragm characterized by its irregularly 

 radiating spicular bands and nodose periphery. This represents an 

 individual of great size. 

 Waverly group. Warren, Pennsyl/van ia. 



TYLODICTYA, gen. nov. 



Page 343. 



Tylodictya (?) TENUIS, Hall (sp.). 



Page 344. 



Figure 4. A small portion of a frond show ing two double nodes, one more 

 distinctly divided. Drawn from a cast of the original impression. 



Figure 5. The original illustration of this species, showing the impression of 

 one of the double nodes and the extremely fine reticulation of the 

 surface, but with the specimen oriented differently than in fig. 4. 

 Waverly group. Warren, Pennsylvania. 



