THE A.LGAE OF BERMUDA. 7 



whore 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 w T ith 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 w r e 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 w T e 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 w T ell 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 

 34 

 30 

 20 

 34 



IN 



24 

 43 

 63 



11 32 33 



Great Britain 



28 



N. and NW. France 



24 



Bay of Biscay 



11 



Mediterranean 



29 



( 'anaries 



19 



New England 



22 



Florida 



32 



Jamaica 



3S 



Barbados 



33 



26 



27 



26 



25 



25 



18 



33 



31 



23 



21 



16 



19 



11 



40 



32 



11 



