A Monograph of the Grenns Alaria. (J 5 



as a representative of the colder waters of the North Atlantic. 

 Its occurrence in Paget Sound and the Alaskan coasts,^) detached 

 and isolated localities for the distribution of the species, requires 

 a careful revision. If it could be proved positively, the species 

 would be the only one common to both the Atlantic and the 

 Pacific Ocean. 



Excepting the doubtful species above mentioned, each species 

 has a more or less fixed area of distribution. Out of 15 species 

 ennumerated in this Monograph, 3 species are from the North 

 Atlantic coasts and 12 from the Pacific. The Arctic Sea can by 

 no means be said to have been thoroughly explored. Yet it is 

 known that A. grancUfolia J. Ag. flourishes luxuriantly about Spitz- 

 bergen and A. Pylaii Geev. may very likely extend there. In the 

 Siberian Sea, A. doUchorhachis Kjellm. is found, and this species 

 is known to extend into the North Pacific through Bering Strait. 

 From the Arctic coast of Alaska only one record of Alaria has 

 been known. The record is based upon one of Ratheock's sketches 

 of algae determined by Haevey as A. esculenta. In Haevey's time 

 the specific limitation of A. esculenta was much broader than at 

 present, so the accuracy of the sketch is rather to be doubted. 

 Yet it gives an evidence that certain species of Alaria exists on the 

 Arctic coast of Alaska. 



It is a noteworthy fact that many of the species of the North 

 Pacific have very limited areas of distribution, while the North 

 Atlantic species, though few in number, have much wider distri- 

 bution. In the Pacific, A. fistulosa has the widest range of distribu- 

 tion, extending from the South Kuriles towards tlie north-west up to 

 Dall Island. Several others are quite local in occurrence. A com- 

 parison of the distribution in the Atlantic and the Pacific is especi- 



1) Eeported by Sacndees iinder A. fragills. 



