516 DICKIE, ARCTIC ALGJE. 



Ectocarpese. 



Chsetopteris plumosa, Kiitz. 3 fathoms, N. lat. 73° 20', 

 W. long. 57° 20'. 



Rhodosperme^. 

 Halymeniese. 



Dumontia sobolifera, Lamr. 3 fathoms, N. lat. 73° 20', 

 W. long. 57° 12'. 



Folysiphoniese. 



Polysiphonia urceolata, Grev. On Ch. plumosa. 



Corallinese. 



Melobesia polymorpha, Harr. On stones, 15 fathoms. Union 



Bay. 

 Kallymenia Pennyi, n.s. Harvey MS. Assistance Bay, 15- 



20 fathoms. 



Chlorosperme^. 



Confervacese. 



Cladophora lanosa, Kiitz. 2-6 fathoms, N. lat. 73° 20', 

 W. long. 57°. 



C. sp. nov, ? On driftwod, lat. m° 53'! 



Conferva melagonium, Web. & Mohr. Assistance Bay. 

 Attaining 5 feet in length. 



C. glacialis, Kg. ? Matted crust on stones in a stream, Pros- 

 pect Hill, winter quarters, south end of Cornwallis Land. 



C. airea, Dillw. ? With others, N. lat. 73° 20^, W. long. 

 57° 16'. 



niothrichese. 



Ulothrix zonata. Kg. "1 



U. squalls. Kg. I Wet rock on island. N. lat. 73° 20', 



Scytonemese. ^ W. long. 57° 16' and 57° 20'. 



Sirosiphon ocellatus, Kg. J 



Bivularieae. 



Rivularia microscopica, n.s. Very minute ; on Enteromorpha 

 compressa. 



Oscillatoriese. 



Oscillatoria sj). ? Thin green crust on limestone. Seal Island, 

 Welliugton Channel. 



Ulvaceae. 



Prasiola arctica, n.s. with Nostoc microscopicum ; winter 

 quarters. 



Enteromorpha compressa, Hook. Pools on shore above sea- 

 level, Beechey Island, Assistance Bay, and Baring Bay. 



ITostochinese. 



Nostoc microscopicum, Carm. On stones in stream, winter 

 quarters. 

 N. Sutherlandi, n.s. Winter quarters. South-Cornwallis 

 Land. 



