302 KJELLMAN, THE ALG^ OF THE AKCTIC SEA. 



also in Baffin Bay. The northernTnost point where it is certainly known to occur is 

 Fairhaven on the north-west coast of Spitzbergen Lat. N. 79° 49'. 



Localities: The Norwegian Polar Sea: Nordlanden, rather common; TromsO amt 

 at Reno; Finmarken common and abundant at Maaso, Gjesvser, and the coast of Magero, 

 more scarce at Oxfjord and Talvik. 



TAe Greenland Sea: Along the west and north-west coast of Spitzbergen, pretty 

 common, but not abundant. It is the most common Ulvacea of Spitzbergen. 



The Murman Sea: the west coast of Novaya Zemlya and Waygats rather common, 

 but not abundant. 



Baffin Bay: Cumberland Sound (?); probably common and abundant on the west 

 coast of Greenland high towards the North. In case the alga called Ulva latissima by 

 AsHMEAD is the present species, as I have supposed it to be, it would be found even 

 north of 78:th Lat. I have seen specimens from Tessarmiut, Nanortalik, Juliaueshaab, 

 Godthaab, Sukkertoppen, and Holstenborg. 



Gen. Diplonema novum nomen. 



Typ. Ulva perciirsa Le Jol. Liste Alg. Clierb. p. 55. 



Diplonema percursum (Ag.) 

 Conferva percursa Ag. Syn. Alg. p. 87. 



f. typica nob. 



f. thalli diametro longiore 20 — 25 f.i. crasso; cellulis in sectione longitudinali rectangularibus, membranis 

 tenuioribus. 



Exsicc. Tetranema percursum Aresch. Alg. Scand. exsicc. N:o 125. 



Enteromorpha percursa Wittr. et Nordst. Alg. exsicc. N:o 140. 



f. crassiuscula nob. 



f. thallo diametro longiore 30 — 35 /(. crasso; cellulis in sectione longitudinali subquadratis, membranis 

 crassioribus. 



Syn. Enteromorpha confervoides J. G. Ag. Spetsb. Alg. Bidr. p. 11. 



» percursa Croall, F1. Disc. p. 463. 



» » Dickie, Alg. Sutherl. 1, p. 143. 



» » Kjellm. Algenv. Murm. Meer. p. 51. 



Scytosiphon compressus y Lindbl. Bot. Not. p. 157. 



» i> y confervoides Sommerf. Spitsb. Fl. p. 232. 



Ulva percursa Sommerf. Suppl. p. 187. 



Be/nark. I perfectly agree with Areschoug that Agaedh's Conferva percursa is 

 to be regarded as the type of a separate genus, if Ulva, Monostroma, and Enteromorpha 

 are considered as genera. But as the name given to the genus by Areschoug ascribes 

 to the alga in question a characteristic which it does not possess, namely that of being 

 four-sized and formed of four cells in transverse section, I propose that that unsuitable 

 name be exchanged for that of Diplonema. I have already mentioned (in Algenv. 



