— 161 - 



9. 0. parrulum A. Braun Alg. Unicell. 1855, p. 55. Brochidium 

 parvulum .Perty 1 852. 



With the preceding' species in muddy ricefield. 



Area: Europe, N. America, Ceylon, Sumatra, Australia, and W. Africa. 



Ord. Conjugated. 



Fam. Zygnemaceæ. 

 Spirogyra Link. 



10. S. neglecta Kütz. Spec. Algar. 1849, p. 441 ; Rabenh. Flor. 

 Europ. Algar. Ill, p. 248 ; Petit Spirog. de Paris, p. 26 , t. IX, f. 1—5. 



Zygnema neglecta Hass. 1845. 



Grass, cell, veget. 65 // ; long, zygosp. 84 — 92 a ; lat. zygosp. 61 —66 fi. 

 In stagnant water in riverbed. 



Area: Europe and N. America, West Indies, Central and W. Africa (var. 

 ternata). Ceylon. 



11. S. decimina (Müll.) Kütz. Phyc. Germ. p. 223; Rabenh. Flor. 

 Europ. Algar. Ill, p. 242; Petit Spirog. de Paris, 1880, p. 25, t. VIII, 

 f. 1-3. 



Forma major, cellulis vegetativis diametro 2V'2 — 5 (usque 6)-plo lon- 

 gioribus; cellulis fructiferis non -infïatis ; chromatophoris 3 cum marginibus 

 asperis, anfractibus 2V2 — 4V2. 



Grass, cell, veget. 46 — 50 //; long, zygosp. 81—92 u; lat. zygosp. 

 46-49 fi. 



In stagnant water. 



Area: Europe, N. America, Madagascar and Ceylon. 



12. S. Schmidtii West & G. S. West, n. sp. (Tab. nostr. IV, tig. 43 

 -45). 



S. cellulis vegetativis diametro 7 — 10-plo longioribus, extremi- 

 tatibus non replicatis; chromatophoris 2 — 3, angustis, laxis, cum 

 marginibus leviter crenulatis et pyrenoidibus magnis, anfractibus 

 2V2 — 4; conjugatione scalariformi, cellulis fructiferis inflatis; zygo- 

 spores elongato-ellipsoideis, diametro 2 — 2V-2-plo longioribus, polis 

 rotundatis vel conico-rotundatis ; membrana zygosporæ maturæ 

 crassa, lutea — brunnea, mesosporio scrobiculato. 



Grass, cell, veget. 31 — 35//; crass, cell, fruct. 53 — 59 //; long, 

 zygosp. 88—118//; lat. zygosp. 44—46/^. 



It is perhaps nearest to S. fluviatilis Hilse but is distinguished by 

 its less diameter, its longer cells, its fewer and different chromatophores, 

 and by the form of its zygospores. 



In stagnant water in riverbed among S. neglecta and AS', gracilis. 



11* 



