vol.i] Setchell- Gardner. — Algce of Northwestern America. 357 



Family SQUAMARIACE^E . 



Petrocelis Middendorfii (Ruprecht) Kjellman. 



Forming a close covering on rocks in the upper litoral zone. 

 Harvester Island. Uyak Bay, Kadiak Island, Alaska, TT.A.S. 

 and A.A.L., No. 5124! ; west coast of Whidbey Island, Wash., 

 X.L.G., Nos. 74!, 262!, 488!= 7 



Our plants are all sterile, but have the pronounced basal 

 portion, branching, etc., characteristic of this species. 



Cruoria Pacifica Kjellman. 



On stones and mussel shells, in the upper sublitoral zone. 

 Port Clarence. Alaska, Kjellman (1889, p. 26). 



Family CORALLINACE^E. 



The crustaceous forms have all been submitted to M. Foslie, 

 of Trondheim, Norway, who has determined them and examined 

 and approved the following account of the species (under the 

 first four genera ) . 



Clathromorphum circumscriptum (Strcemfelt) Foslie. 



On stones in tide pools in the litoral and sublitoral zones. 

 Port Clarence, Alaska, Kjellman, (1889, p. 22, under Litho- 

 thamnian durum); near Iliuliuk, Unalaska, Alaska, W.A.8. and 

 A.A.L., Nos. 4022!, 4081a!; Kukak Bay and Sitka, Alaska, 

 Saunders (1901, p. 442). 



Clathromorphum compactum (Kjellman) Foslie. 



On mussel shells, lower litoral zone. St. Michael, Alaska, 

 W.A.8., No. 5156y! : Prince William Sound, Alaska, Saunders 

 (1901, p. 422. under Lithotluimnion compactum). 



Clathromorphum loculosum (Kjellman) Foslie. 



St. Lawrence Island, Alaska, Kjellman (1889, p. 21, under 

 IAthothamnion loculosum) . 



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