598 



SIK J. W. DAWSON ON EUKEOWS AND TRACKS OF 



Eig. 2. — Rusirhmtes acadicus. A Crustacean Track, showing the 

 marks of the edge of the carapace. Carboniferous ; Cape Breton. 



Pig. 3. — liusiclmites (Fsammichnites) clintonensis, sp. nov. 

 Silurian of Ontario, Canada. (From a Photograph.) 



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