879 Rhyn. 



ports on the N. Y. State Cabinet. Utica slate formation. Ilia, 



Rhombodictya reniforme, Whitfield. Bull. A. M. N. H. 

 N. Y. (as above) p. 347, plate 35 figs, {see under R. discum) 

 2, small specimen, apparently double; 3, very perfect medium 

 size specimen; 4, large and most perfect specimen found; 5, 6, 

 7, enlargements of surface as seen under different lights. Sub- 

 stance of all the specimens found changed to pyrite, and not 

 over 1-30 inch thick; rods or threads very distinct, long and 

 rigid, 1-16 to 1-50 incn apart, always oblique to the apparent 

 axis; secondary threads somewhat flexuous, finer, closer to- 

 gether, set at various angles from 50° to 80°, never 45°, to the 

 primaries; third still finer series at other angles ; the whole a 

 fine net-work. Figs. 8, 9, represent numerous small individ- 

 uals scattered over and through the shale ; possibly fragments ; 

 possibly young ones; possibly a variety, rhombiforme^ Whit- 

 field. Doubtful, whether these bodies are animal sponges, or 

 vegetable sea weeds. ''They seem unlike vegetable remains 

 on account of the rigid nature of the frame work, and their 

 pyritous remains ; while the carbonaceous, smooth, filmy struc- 

 ture, aud shapeless form is somewhat plant-like." Ill a. 



Rhynehodus erassus, Newb. Pal. Ohio, Vol. 1, 1873, page 



VIII a.. 



Neco berry. TaiOfiioA^oL A^^^^^^^/7. Axix^ 



312, plate 29, ^g, 3, a lower? mandibular fish-tooth, consider- 

 ably worn, seen from inside, showing the triturating surface, 

 or chewing crown, thick and strong; one of a number taken 

 from the Corniferous limestone quarries at Sandusky, Dela- 

 ware, and Kelley's island, Ohio; none completely preserved ; 

 original form probably not unlike R, secans^ but broader and 

 stronger and better fitted for crushing than cutting VIII a. 



