132 



iS. I. Smith — Crustaceans of the Atlantic Coast 



the comparison be restricted either to the Decapoda proper, the 

 Schizopoda, or the Cumacea. 



The numerical distribution of the above twenty-six species known 

 to be Greenlandic, along the w^estern side of the North Atlantic is 

 shown in the last five columns of table (D) beyond. 



The similar distribution of the thirty-seven species common to our 

 fauna and that of the European seas, and also the whole number of 

 species recorded from each of the regions included in the second, 

 third, fourth and fifth columns, is given in the following table, in 

 which the fifth column is made to include the number of species 

 found at less than fifty fathoms along the New England coast north 

 of Cape Cod, while the other columns include the same regions as in 

 table (A) : 



Comparing the number of European species found in each of the 

 four regions north of Cape Cod, with the whole number of species 

 recorded from each of these regions, as given in the last line of the 

 table, it will be seen that the proportion of European species is very 

 nearly the same in each of the regions, while south of Cape Cod there 

 is a very sudden diminution in the number of European species. 



Thirty of the thii'ty-seven species common to the two sides of the 

 North Atlantic are known to occur on our coast in fifty fathoms or 

 less, while some of the remaining species are recorded from equally 

 shallow water in the European seas. This is a smaller proportion of 

 deep-water species than is found among the species which are left as 

 peculiar to the fauna between Cape Cod and Labrador, which shows 

 that the species common to Europe and America are not predomin- 

 antly deep-water species. 



