. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . is c. Fig. 94. The sponge Halichondria associated with the Alga Strucen. In 1 the Struvea is seenemerging from the sponge at b; 2, & section through the sponge (schir) showing its canals (c)and the branches of the Alga (a) traversing it in all directions; 3, some isolated branches ofthe Stmvea. apparently symbiotically associated with the common freshwater sponge, andthe siphonocladiaceous genus Struvea is similarly related to the spongeHalic

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. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . is c. Fig. 94. The sponge Halichondria associated with the Alga Strucen. In 1 the Struvea is seenemerging from the sponge at b; 2, & section through the sponge (schir) showing its canals (c)and the branches of the Alga (a) traversing it in all directions; 3, some isolated branches ofthe Stmvea. apparently symbiotically associated with the common freshwater sponge, andthe siphonocladiaceous genus Struvea is similarly related to the spongeHalichondria (fig. 94). Quite a number of the Chlorophycese are inhabitants of the Arctic andAntarctic areas, and are capable of withstanding prolonged freezing. Amongthese are several species of Chlamydomonas, and another species of this genus(Chi. nivalis) is the Red Snow plant. In this connection the observations ofTeodoresco (09) on the zoogonidia (= vegetative cells) of Dunaliella areinteresting, as he showed that their movements only ceased when the tem-perature of the salt water had been lowered to somewhere between -- 17° - 22-5° C. Cultur

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Keywords: ., bookcentury1900, bookdecade1910, bookpublishercambridgeengtheuni