﻿144 Canadian Record of Science. 



forms (the one with a massive and the other with an 

 encrusting casnosteum), both of which have been identified 

 with this species by J. W. Salter and E. Billings. The 

 encrusting form, which often almost entirely covers the 

 exterior of shells of Maclurea Logani, has somewhat the 

 appearance of a Labechia. 



( Silurian species. ) 



Stromatopora Hindei, Nicholson. 



Stromatopora Hindei, Nicholson. 1874. Ann. and Mag. Nat. 



Hist., ser. 4, vol. XIII., p. 12, and 



p. 13, figs. 3, a-c. : also Eep. Pal. Pro v. 



Ontario, p. 13, figs. ], a-c. 



" Common in ' a magnesian limestone of the age of 



the Niagara limestone (Upper Silurian), at Owen 



Sound, Ontario. Collected by Mr. G. J. Hinde. " 



Nicholson. This species must be abandoned, as, in a 



letter recently received by tlie writer, Professor Nicholson 



says that " it was founded on a weathered Ccenites 



perforated by some boring organism." 



Stromatopora striatella, Nicholson. 



Stromatopora striatella (D'Orbigny), Nicholson. 1875. 



Ptep. Pal. Prov. Out., p. 49. 

 " Common in the Niagara Limestone of Thorold. Rare 

 at Rockwood." Nicholson. This identification, however, 

 is not confirmed, as the occurrence of <S. striatella, 

 D'Orbigny (which is now known to be a Clathrodictyon) at 

 these localities, is omitted by Professor Nicholson in his 

 most recent references to that species. 



Caunopora Walkeri, Spencer. 



Caunopora Walkeri, Spencer, 1884. Bull. Mus. Univ. St. 

 Missouri, vol. I., No. 1, p. 46, pi. 6, 

 figs. 9 and 9a. 

 Lower beds of the Niagara formation at Hamilton, 



