100 



THE CANADIAN NATURALIST. 



[April 



objectives made by Ross, and by Smith and Beck ; and also with good 

 French objectives. 





1. Weathered specimen of Eozodn Canadense from the Calumet, 

 of the natural size. The replacing silicate is white pyroxene. 



2. Vertical transverse section of the specimen figure 1. 



The specimens first mentioned are masses, often several inches 

 in diameter, presenting to the naked eye alternate laminas of ser- 

 pentine, or of pyroxene, and carbonate of lime. Their general as- 

 pect, as remarked by Sir W. E. Logan (Geology of Canada, 1863 } 

 p. 49), reminds the observer of that of the Silurian corals of the 

 genus Stromatopora, except that the laminae diverge from and 

 approach each other, and frequently anastomose or are connected 

 by transverse septa. 



