DURING THE ARCTIC EXPEDITION. 7 



DlCTTOTACE^. 



■ 



Dictyosiphon FCExrcuLACEUS, Grev. 

 Rawlings Bay, 80° 20' N. • • 



The specimens of very slender habit and not in fruit. It has 

 been found also at Disco Island. 



Chordariaceje. 



Chordaria flagelliformis, Ag. 



The specimens very dwarf, of slender habit, and very fragmen- 

 tary. Discovery Bay, 20 fathoms, August 1876. 



EcTOCARPACEiE. 



p 



Ectocarpus siliculosits, Lyngb. 



The specimens make a near approach to JE. viridis, Harv., de- 

 scribed in ' Nereis Boreali-Americana,' respecting which the author 

 of that work remarks, "I fear this is too near JE. siliculosus" 



From Bessels Bay, 7-g- fathoms, August 21th, 1875. The spe- 

 cimens were richly incrusted with Diatoms, to be noticed after- 

 wards. 



Ch^topteris plumosa, Lyngb. 



Cast up on Floeberg Beach, 82° 27' N., July 1876. 



Ultaceje. 



Ulta latissima, L. 



Fragments from 10^ fathoms, 30th June, 18/6, 82° 27' N. ; also 

 high-water margin at Mushroom Point, 82° 28' N. 



Exteromorpha clathrata, Grev. 



Hayes Sound, Buchanan Strait, 79° JN\, and Port Sheridan, 

 82° 27' N. 



i 



Prasiola Sauteri, Menegh. 



Prevoost Island near Cape Sabine, about 78° 40' N. I had pre- 

 viously seen specimens from marshy spots at Disco. 



Confervace^e. 

 Chjbtomobpha melagonium, Web. Sf Mohr. 



Discovery Bay. 



ZTGNEMACEiE. 



Zygogonium Agardhii, Rabh. y var. nigricans 

 Pools on the land, Discovery Bay. 



