366 JV. A. Setchell — Classification and Geographical 



minations and lead us to believe that they are not very abundant. 

 One species of the genus is credited by Areschoug/ to California, 

 but it seems very doubtful whether this is correctly referred or not. 



The most interesting points of distribution of this subtribe are 

 the occurrence of the peculiar genus JJlopteryx- on the Japanese 

 coast and of the peculiar genus JEisenia on the coast of California.^ 



The Egregiecie contain the single species Egregia Menziesii (Turn,), 

 Aresch., which combines in itself the characteristics both of the 

 Ecklone?e and of the Alarieae. It is found only on the coast of 

 California and this limited distribution makes its systematic position 

 even more interesting. 



The subtribe Alarieoe is the second largest subtribe of the order, 

 containing at present about 19 species. Of these 18 belong to the 

 genus Alaria and 1 to Pterygophora. The latter is peculiar to the 

 coast of California. 



The species of Alaria are entirely northern and prefer the colder 

 waters. Their distribution is similar to that of the members of the 

 Laminariese. Alaska leads with 10 species credited to its coast; 

 Spitzbergen has 6, northern Europe 4, northern Asia and Baffin Bay 

 3 apiece, the Sea of Ochotsk and New England have 2 each, while 

 Japan and. California each have 1. Although the regions most care- 

 fully examined have the advantage as regards the greater number 

 of species credited, yet there is little room for doubting that the 

 Alar ice are most abundant in the coldest waters and diminish as 

 the waters become warmer. This can be readily seen on the coast 

 of New England. In Long Island Sound and the region south of 

 Cape Cod there are no species of Alaria ; on the coast of Massa- 

 chusetts 1 species is found. On the coast of Maine there are at 

 least 2 species; and in Baffin Bay there are at least 3. 



We find then that the subtribes of the Laminariace?e may be 

 divided into those characteristically northern and those character- 

 istically southern. 



Of the northern subtribes both the Laminariese and the Alarieae 

 are circumpolar while the Agarese and Egregieae are more limited 

 in their distribution. The Laminarie^ extend down along the 

 western coast of Africa to Cape Horn and beyond to St. Paul Is., 

 and perhaps also down along the western coast of South America. 



Of the southern subtribes, the Macrocysteae, and the Eckloneae are 

 both circumpolar and the Lessonese very nearly so. These subtribes 

 are not however confined as strictly to the southern hemispheres as 



» Obs. Phyc, Pt. 5, p. 1? 2 Qf p. 275. 8 cf p, 348. 



