THE ALGAE OF BERMUDA. 7 



where it seemed desirable, especially from distinctively American 

 works, like Harvey, Nereis Boreali-Americana and Borgesen, The 

 Marine Algae of the Danish West Indies. The latter is specially 

 useful in connection with the present work, being a careful study of 

 the marine flora of a small group of islands, of character not unlike 

 Bermuda, though somewhat farther south. As Borgesen's work is 

 still incomplete as this paper goes to press, full comparisons are not 

 yet possible. 



We had hoped to publish with the present paper somewhat full 

 comparisons of the floras of Bermuda and other regions, but the list 

 for the Danish West Indies, perhaps the most instructive, is not 

 fully available. We have reluctantly had to omit from our list the 

 families Rhizophyllidaceae, Squamariaceae and Corallinaceae ; with- 

 out careful study of the types any conclusions in these critical families 

 would be uncertain, and in the present European conditions such 

 study has not been practicable. In view of this we have made only a 

 short statement, by classes, showing the percentage of the Bermuda 

 species common to nine of the best known regions where a similarity 

 might be expected. If later we are in position to take up the families 

 now omitted, and a full account of the algae of the Danish West Indies 

 is available, the proposed full comparison may be made. In the 

 present comparison we have not included the Class Myxophyceae; 

 first because the species of this class are largely cosmopolitan, second 

 because in many regions where the other classes are fairly well known, 

 the Myxophyceae have been little studied. We have considered a 

 species as common to two regions, though represented by different 

 forms or varieties in each; pelagic species, known only as washed 

 ashore, have not been included. 



Percentage of Bermuda algae represented in other floras. 



Chlorophyceae Phaeophyceae Rhodophyceae Total 



Great Britain 28 34 26 27 



N. and NW. France 24 30 26 25 



Bay of Biscay 11 20 25 18 



Mediterranean 29 34 33 31 



Canaries 19 28 23 21 



New England 22 24 16 19 



Florida 32 43 44 40 



Jamaica 38 63 32 41 



Barbados 33 41 32 33 



