8. I. Smith — Crufitaceans of the Atlantic Coast. 



181 



the Greenland fauna has been studied ahuost exclusively by Euro- 

 pean zoologists to whom the fauna of our coast has usually been 

 very little known. The earlier American zoologists fell into the 

 same error, and, being without specimens of the known European 

 species for comparison, and without sufficiently accurate figures or 

 descriptions, described as new species already known from European 

 and Greenlaudic seas. This process has sometimes been reversed, 

 however, the species being first described from our coast and later 

 from the European, But the crustaceans have been more fortunate 

 in this respect than some other classes of animals. 



Further on, I have discussed the facts in regard to the geographical 

 distribution of the Thoracostraca of Greenland, and need not specially 

 allude to them here. The relation of the Thoracostracan fauna of the 

 I'egiou between Cape Cod and Labrador to that of Greenland, that 

 of Europe, and that of the region of Bering Sea, is shown in a gen- 

 eral way in the summary, previously given, of the table of distribu- 

 tion (A), but is better shown if we omit from the summary the 

 southern species (1, 2) which properly have no place in the fauna. 

 Rejecting these, there are left belonging to the fauna between Cape 

 Cod Bay and Labrador, sixty species, of which twenty-six are known 

 in Greenland, thirty-seven in Europe, and fourteen in the region of 

 Bering Sea. This is shown for diiferent groups of Thoracostraca, in 

 the following table : 



This shows that a little more than three-fifths (sixty-one per cent,) of 

 the species known to our northern marine fauna are common to the 

 European fauna, while over two-fifths (forty-three per cent.) are found 

 in Greenland, and that the proportions are very nearly the same if 



