56 MATTHEW. 



using the name Olenellian for any Cambrian fauna in the At- 

 lantic region. This region had a physical history different from 

 that of the interior and the St. Lawrence Valley, from the begin- 

 ning of the Etcheminian to the middle of the Ordovician, and 

 had faunas more closely allied to those of Europe, than to the 

 parts of America to the north and west. This has been sig- 

 nalized by Dana in his descriptions of the " Eastern Border 

 Region," and stands out distinctly in the earliest Palaeozoic time 

 — the Etcheminian. 



St. John, N. B., Canada, Nov., i8j8. 



