. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . c Fig. 195. Trichophilus Welckeri Weber v. Bosse. A, thallus within a hair of Bradypus (theThree-toed Sloth), with some of the cells forming zoogonidangia; B, a single zoogonidium ;C. a group of smaller motile cells (gametes ?). All x 470 (after Weber van Bosse, from Wille).. v— Fig. 196. A—C, Gongrosira viridis Kiitz., x500. D—F, G. stagnalis (G. S. West)Schmidle, x 200. zg, zoogonidangium. Microth amnieae 303 Isogametes with two cilia are k

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. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . c Fig. 195. Trichophilus Welckeri Weber v. Bosse. A, thallus within a hair of Bradypus (theThree-toed Sloth), with some of the cells forming zoogonidangia; B, a single zoogonidium ;C. a group of smaller motile cells (gametes ?). All x 470 (after Weber van Bosse, from Wille).. v— Fig. 196. A—C, Gongrosira viridis Kiitz., x500. D—F, G. stagnalis (G. S. West)Schmidle, x 200. zg, zoogonidangium. Microth amnieae 303 Isogametes with two cilia are known to occur in several genera, and thegametangia may be formed from any cell, except in Gongrosirct, in whichthey are formed only from the lower cells of the thallus. From 6 to 16gametes arise in a gametangium in Endoderma, but they are much morenumerous in Gongrosira and Leptosira. In the latter they fuse by theirposterior extremities, forming first a spindle-shaped zygozoospore, whichthen becomes a resting zygote.

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