Vol.. ij Seichell-Oardner . — Alga> of Norihwe stern America. 251 



All the plants mentioued a])Ove which have been seen by ns 

 belong to this form, the only difference between them being in 

 thickness. Some are very much more robust than others. For 

 some unexplained reason this species seems to be restricted, on 

 our coast, to the shores of Alaska, while on the eastern coast of 

 North America it descends into very much warmer waters. 



Chordaria flagelliformis f. ramusculifera Kjellman. 



In the sublitoral zone. St. Lawrence Island, Alaska, Kjellman 

 (1889, p. 48). 



This form is near to, if not identical with, 6'. flagelliformis f . 

 (I e II so Farlow. 



Chordaria flagelliformis f. Chordaeformis Kjellman. 



Upper sublitoral zone. Konyam Bay, Siberia, Kjellmati 

 (1889, p. 48). 



Although this form does not quite enter our limits, it is 

 mentioned here since the species mentioned above as Myelophijcus 

 infestinalis Saunders seems to come very near to it. The rela- 

 tionship at present seeming to exist between Chordaria, Myelo- 

 phycus, and Analipus certainly needs more careful consideration 

 and study, as will be emphasized farther under the next species. 



Chordaria abietina Ruprecht. Plate 18. 



On rocks, at or just below low water mark. Dutch Harbor, 

 Amaknak Island, Bay of Unalaska, Alaska, B. G. McGregor, No. 

 5692 ! ; near Ilinliuk, Unalaska, Alaska, TU.^ .aS'. and A.A.L., No. 

 4058!; Shumagin Islands, Alaska, Saunders (1901, p. 424); 

 Cormorant Rocks, Uyak Bay, Kadiak Island, Alaska, W.A.8. 

 and A.A.L., No. 5132!; Prince William Sound and Sitka, 

 Alaska, Saunders (1901, p. 424) ; Victoria, B.C., Tilden, No. 

 348! ; Port Renfrew, B. C, Butler and Pollei/, No. 43! ; Whidbey 

 Island, Wash., N.L.G., No. 31! 



This species is probably not uncommon on the western coast of 

 North America from just above Point Conception, California, to 

 Unalaska, and even f)n to the Asiatic shores. The description 

 must be amended in one important respect, and that is as regards 

 the base. The base is not made up of a crust formed by the 

 overlapping disks of a group of plants, but there is a distinct, 



