94 M. FOSLIE. [1905 



240 by 70—110//. Specimens from the Kurile Islands bore such 

 organs towards the end of June. 



A specimen from Rubetsu, the north-side port of the largest 

 of the Kurile Islands called Etorufu, I also refer to Ph. loculosum 

 f. evanida. It was collected by Mr. Yendo a few feet below 

 low water mark. This specimen fully resembles certain forms of 

 Ph. compactum f. circumscripta in habit. The cells partly are as 

 small as in the latter, but the conceptacles are usually larger. A 

 sterile specimen from St. Paul of the Pribilof Island in the Bering 

 Sea (S etc hell, no. 5811) coincides with the latter. I formerly 

 considered it identic with Ph. compactum f. circumscripta, as in 

 habit it exactly resembles certain forms of the latter, and over- 

 grown conceptacles do not occur, but the cells are usually a little 

 larger and therefore the specimen probably belongs to Ph. locu- 

 losum f. evanida. — A big piece of a dead specimen from Allex 

 Island of the Aleutian Islands (comm. Dr. Dawson!) much ap- 

 proaches Ph. compactum f. typica, but the cells are usually a little 

 longer than in the latter, and therefore also this specimen is likely 

 referable to Ph. loculosum. 



Phym. compactum is frequently attached to rocks or stones, 

 often, however, also to shells of mussels. A specimen from Ice- 

 land attached to the stem of Laminaria hyperborea (Hrauni Fljot, 

 Davids son!) is almost quite like Lithoph. Crouani in habit and 

 only almost 1 mm. thick, but it bears sporangia and belongs to 

 the species in question. On the Atlantic coast of North America 

 crusts feebly developed of this species once have been found atta- 

 ched to the shell of a live crab associated with young crusts 

 probably of Lithoth. Iceve. The alga occurs both in places sheltered 

 with strong tides and in exposed ones. In the latter it now and 

 then appears in rock-pools in the litoral region, and it descends 

 to a depth of about 20 fathoms. It is commonly spread almost 

 everywhere in the areas where it is dispersed, seldom occurring 

 in any large number, but often growing gregariously with other 

 calcareous alga?, particularly with Lithoth. lasve. Mature sporangia 

 have been found in June — November. 



The forms typica and circumscripta occur in all the areas 



