6o2 TRANS. ST. LOUIS ACAD. SCIENCE. 



The general form of those specimens that I have seen are irregu- 

 lar masses not more than four or five centimetres long. They are 

 generally highly silicified and occur in cherty nodules, nPt infre- 

 quently associated with Sponges ; but the layers and points are 

 generally of a different color from the filling of the rest of the 

 organism. 



Formatio7i a?id Locality. — It occurs in the " cherty-beds" of the 

 Niagara formation at Hamilton, Ontario. 



Note. — In the Upper Silurian rocks of America, besides the above 

 described species of Stromatoporidt^, Caunopora hudsonica (Dawson), is 

 from the Upper Silurian south of Hudson's Bay, discovered bj Dr. Robert 

 Bell (Assistant Director of the Geological Survey of Canada) ; Dicty- 

 ostotna undulatum (Nicholson), was collected by the Rev. H. Hertzer in 

 the Niagara formation of Louisville, Kentucky: Stromaiopora osteolata 

 (Nicholson), was obtained by Mr. John Wilkie in the Guelph formation, at 

 Guelph, Ontario; and Coenostoma galtense (Dawson) is from the Guelph 

 formation at Gait, Ontario. Stromaiopora hindei (Nicholson) was ob- 

 tained in the Niagara rocks at Rockwood and Owen Sound, Ont. 



PART III. 



FIFTEEN NEW SPECIES OF NIAGARA FOSSILS. 



At Hamilton, Ontario, nearly two hundred species of fossils 

 belonging to the Niagara series have been found, but only after 

 a long and faithful search, for the conditions of preservation 

 are not very favorable. (See " Geology of the Region about the 

 Western End of Lake Ontario," by the writer, in Canadian Natu- 

 ralist, Montreal, 1882.) 



Besides the Graptolitidce and Stromatoporidce., already de- 

 scribed, there are several species of Sponges which have not yet 

 been fully studied. There are various other new species of fossils, 

 of which I venture upon the description of the fifteen following 

 species, several of them being both remarkable and interesting : 



Palceaster granti, n. s. 



Fenestella bicornis, n. s. 



Polyfora {Fenestella?) albionensis, n. s. 



Rhinopora venosa, n. s. 



Clathropora{^i) gracilis, n. s. 



