214 CYsTIPHORA. 
Size. Cells ‘004 mm. diam. to -01 mm. long ; families (05 mm. 
Rabh. Alg: Eur. ii., 56. Kirch. Alg. Schles. 255. 
In ditches. 
Plate LXXXVII. fig. 2. Families magnified 400 diam.; a, b, c, d, 
cells in various stages of subdivision, further magnified—after Reinsch. 
Genus 88. MERISMOPEDIA. Meyen. (1839.) 
Cells globose, at the time of division oblong, rather thick, 
teguments confluent, 4-8-16-32-64-128 associated in tabular 
families of a single stratum, forming a quadrate, plane, free- 
swimming thallus. 
Goebel has observed the formation of zoospores in this genus, See 
“ Botanische Zeitung,” 1880, p. 490. 
Merismopedia violacea. Kutz. Spec. 472. 
Thallus mucous, colourless, or nearly so, indefinite, families 
small, composed of 4-32 remote very minute cells ; cell-contents 
homogenous, violet. 
Sizz. Cells -001--0015 mm.; families ‘015 mm. 
Rabh. Alg. Eur, ii., 57. Kirch. Alg. Schles. 254. 
In ponds, ditches, &c., amongst other Alge. 
Plate LXXXVII. fig. 3. Families magnified 400 diam. 
Merismopedia glauca. Wag. Einz. Alg.t.1, D.1. 
Thallus more or less limited, glaucous green, margin slightly 
sinuately crenate; families composed of 16-48-64 (rarely more) 
oval or globose cells; cell-contents pale blue-green. 
Size. Cells -003--005 mm.; families -04--05 mm. 
Rabh. Alg. Eur. ii., 56. Kirch. Alg. Schles. 253. 
Gonium glaucum, Ehrb. Infus. 56, t. 3, f. 5. 
In stagnant water. 
Plate LXXXVII. fig. 4. Families magnified 400 diam. 
Merismopedia punctata. Meyen in Wirgm. Arch. 1839, p. 67. 
Thallus less limited, almost colourless, for the most part com- 
posed of 4-64 remote cells; cell-contents pale blue-green. 
Size. Cells -033 mm.; families 06 mm. 
Kutz. Tab. i., t. 88, f.3. Rabh. Alg. Eur. ii., 57. Kirch. 
Alg. Schles. 254. 
In stagnant water. 
Plate LXXXVII. fig. 5. Families magnified 400 diam. 
