DICKIE ON ARCTIC ALG^. 521 



Other Arctic Algae, from beyond lat. 60°, noticed by other 

 observers, Harvey (" Nereis-Boreali -Americana) ; Agardh 

 (" Species Algarum "), &c. : — 



Fucus distichus, L. Uiva crispa, Lightf. 



F. serratus, L. Porphyra vulgaris, Ag. 



Alaria Pylaii, Grev. Ciadophora rupestris, Kiitz. 



Laminaria digitata, Lam. Cliaetomorpha Piquotiana, 



Asperococcus echinatus, Grev. Mont. 



Myrionema strangulans, Grev. Harmotrichum CarmichaeUi, 



Elachista flaccida, Aresch. Harv. 



Ectocarpus Durkeei, Harv. ? H. boreale, Harv. 



Rhodomela lycopodioides, Ag. H. Wormskioldii, Kiitz. 



R. gracilis, Kiitz. Mougeotia, sp. ? 



Polysiphonia urceolata, Grev. Oscillatoria corium, Ag. 



Corallina officinalis. Lam. Nostoc muscorum, Vaucher. 



Melobesia polymorpha, L. N. microscopicum, Carm. 



Desseria sinuosa, Ag. Found N. verrucosum, Vaucher. 



in lat. 75° N. Scytonema myochroum, Ag. 



Rhodophyllis veprecula, J. Ag. Sorospora montana, Harv. 



Phyllophora interrupta, Grev. Haematococcus frustulosus, 



Ceramium rubrum, Ag., var. S, Harv. 



virgatum. Tyndaridea anomala, Harv. 

 Ulva bullosa, L. 



Summary. 



Of marine AlgcethQVQ have been found beyond 60° N. lat., along 

 the shores of Davis Strait and Baffin's Bay, and their branches — 



Melanospermess - - 25^ 



Rhodospermeoe - - 22 > 63 species. 



Clorospermese • - - 16 J 



The Families represented are the Fitcaceoe, Sporochnacece, Lami- 

 nariaceop, Dictyotocece, Chordariacece.Ecfocarpacece, Corallinacece, 

 Sphcerococcoidoe, Rhodymeniacece^ Cryptomeniacece, Ceramiacece, 

 Ulvacece, and Conjervacem. 



Collections have been few, and many localities have yet to be 

 explored . 



Some of the Algce occur in the greatest profusion. Masses con- 

 sisting chiefly of Fucus vesiculosus, Desmarestia aciileata, Lami- 

 naria longicruris, and Alaria, float about in the summer, set free 

 by the action of icebergs. The multitudes of Diatomacece, abound- 

 ing everywhere in the Arctic Seas and on ice-floes, supply abun- 

 dant material for the support of animal life. In the alimentary 

 canal of various Molluscs brought home in spirits, I have invariably 

 found abundance of Diatoms ; and masses comparable with 

 " sodden biscuit," can be gathered from the ice-floes ; and these I 

 find to be pure Diatomacese. 



Not a few of the species of Algce, occur also on the west coast 

 of America, as shown by Prof. Hai'vey's remarks on Dr. Lyall's 



