302 KJELLMAN, THE ALGH OF THE ARCTIC SEA. 
also in Baffin Bay. The northernmost 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; Tromsé amt 
at Rend; Finmarken common and abundant at Maasd, Gjesveer, and the coast of Magers, 
more scarce at Oxfjord and Talvik. 
The 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. 
Bajjin 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 | have supposed it to be, it would be found even 
north of 78:th Lat. I have seen specimens from Tessarmiut, Nanortalik, Julianeshaab, 
Godthaab, Sukkertoppen, and Holstenborg. 
Gen. Diplonema novum nomen. 
Typ. Ulva percursa.Le Jou. Liste Alg. Cherb. p. 55. 
Diplonema percursum (AG.) 
Conferva percursa Ac. Syn. Alg. p. 87. 
f. typica nob. 
f. thalli diametro longiore 20—25 w. crasso; cellulis in sectione longitudinali rectangularibus, membranis 
tenuioribus. 
Hesicc. Tetranema percursum ArgscH. Alg. Scand. exsicc. N:o 125. 
Enteromorpha percursa Wrrrr. et Norpsr. Alg. exsicc. N:o 140. 
f. crassiuscula nob. 
f. thallo diametro longiore 30—35 ww. crasso; cellulis in sectione longitudinali subquadratis, membranis 
crassioribus. 
Syn. Enteromorpha confervoides J. G. Ag. Spetsb. Alg. Bidr. p. 11. 
» percursa CRroALL, Fl. Disc. p. 463. 
» » Dickie, Alg. Sutherl. 1, p. 143. 
» » KyELLM. Algenv. Murm.. Meer. p. 51. 
Scytosiphon compressus y LinpBL. Bot. Not. p. 157. 
» » y confervoides Sommerer. Spitsb. Fl. p. 232. 
Ulva percursa SomMERF. Suppl. p. 187. 
Remark. 1 perfectly agree with ArgescuouGc that AGarpu’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 ARrEscuouc 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. 
