214 CYSTIPHOR^:. 



SIZE, Cells '004 mm. cliam. 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, J, c, d, 

 cells in various stages of subdivision, further magnified after Eeinsch. 



GENUS 88. MERISIYIOPEDXA. Hey en. (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. 



n/Ierismopedia 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. 



SIZE. Cells '001- - 0015 mm.; families *015 mm. 



Rabh. Alg. Eur. ii., 57. Kirch. Alg. Schles. 254. 



In ponds, ditches, &c., amongst other Alga3. 

 Plate LXXXV1I. fig. 3. Families magnified 400 diam. 



lYIerismopedia glauca. Nag. 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. fg. 4. Families magnified 400 diam. 



IVIe:rismopedia 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. 38, f. 3. Rabh. Alg. Eur. ii., 57. Kirch. 

 Alg. Schles. 254. 



In stagnant water. 

 Plate LXXXVII. Jig. 5. Families magnified 400 diam. 



