Fauna of the Niagara and Upper Silurian Rochs. 125 



advantage o£ by workmen, in the process of quarrying, by blast- 

 ing and excavating. 



In certain parts of the reefs are coves, or pockets, which contain 

 remains of distinct colonies of paleozoic life. For in one cove, 

 you will chiefly find Foraminifera and Zoophyta. In another 

 cove, the Brachiopoda; in another the Crustacea, and so on with 

 each class and species of fossils. A similar state exists in other 

 of the coral reefs ; for the trilobites of Wauwatosa are not found 

 at Waukesha. The magnificent and peculiar Echinoderms of 

 Eacine, are not found in other reef formations ; and the trilobite 

 species, Illcenus imperator, lllcenus armatus, are found in the 

 southerly reefs of Burlington, Bridgeport and Algonquin. 



From the foregoing considerations, aided by geological axioms 

 and other published opinions of accepted paleontological authority, 

 we offer these suggestions, as an efiiort to supply the " missing 

 links"' in our research, as to the age, period and epoch, wherein 

 once lived, moved and had a being, " the fauna of Niagara and 

 Upper Silurian rocks, as exhibited in Milwaukee county, Wiscon- 

 sin, and in counties contiguous thereto." 



