206 SAUNDERS [44 2 ] 



Lithophyllum farlowii Foslie. 



On rocks in the littoral zone, Sitka (138). 



The young plants were somewhat doubtfully referred to the species 

 by Dr. Foslie. 



Lithothamnion compactum Kjellm. 



Forming an indefinite coating on rocks in the sublittoral zone, 

 Prince William Sound (431). 



Lithothamnion glaciale Kjellm. 



In the upper elittoral and lower sublittoral zones. Prince William 

 Sound (430) ; Kukak Bay (427) ; Shumagin Islands (426). Abund- 

 ant in exposed localities. 



Lithothamnion laeve (Stroemf.) Foslie. 



Abundant on rocks in exposed localities in the sublittoral zone, 

 Kukak Bay (425^), with Clathromorphum circumscriptum. 



Clathromorphum circumscriptum (Stroemf.) Foslie. 



On rocks in the sublittoral and elittoral zones. Kukak Bay (425) ; 

 Sitka (441). 



Lepidomorphum yendori Foslie. 



On rocks in the sublittoral zone, Sitka (438). 



Amphiroa tuberculosa Rupr. 



On rocks in the lower sublittoral zone, Sitka (432). 



Amphiroa epiphlegmoides J. Ag. 



On rocks and other algae. Sitka (433) ; Prince William Sound (423). 



Amphiroa planiuscula (Kuetz.) Foslie. 



On mussel shells, rocks, etc., in the lower sublittoral zone. Yakutat 

 Bay (255) ; Prince William Sound (429). 



Corallina arbuscula Rupr. 



On rocks in the sublittoral zone. Shumagin Islands (438). 



Corallina pilulifera filiformis Rupr. 



On rocks in the sublittoral zone. Prince William Sound (435). 



BACILLARIACE^E. 1 



Melosira granulata C. G. E. 



In a freshwater pond, Popof Island, near Kukak Bay ; Kadiak 

 Island ; Cook Inlet. 



1 Determined by Prof. A. M. Edwards. 



