— 165 — 



Lat. 90 a ; apicibus 442 a inter se distantibus. 

 In stagnant water amongst Spirogyra decimina var. 



Area: Europe, N. and S. America, W. Indies, India, Central China, Japan, 

 New Zealand, Australia, and Samoa (var.). 



29. C. Dianæ Ehrenb.; Ralfs I.e. p. 168, t. XXVIII, f. 5. 



Lat. 21/2; apicibus 263 /2 inter se distantibus. 



With the preceding species. 

 Area: Ubiquitous. 



30. €. parvulum Näg. Gatt, einzell. Alg. 1349, p. 106, t. VI G, f. 2. 

 Lat. 10,5«; apicibus 130 — 144/2 inter se distantibus; diam. zygosp. 



33 p.. 



In stagnant water among other Desmids (with zygospores). 

 Area: Ubiquitous. 



31. C. ralosporum Wittr. in Nova Acta Soc. Scient. Upsala, ser. 3, 

 VII, 1569, p. 23, t. I, f. 11. 



Forma: lat. 7 — 7,5/2 apicibus 87 — 89/2 inter se distantibus. 



This plant, which occurred in great abundance in stagnant water in 

 the jungle, differs from typical CI. calosporum in being a little narrower, 

 the ventral margin having precisely the correct curvature. 



Area: Europe, Ceylon. 



32. C, Venus Külz. Phyc German. 1845, p. 130; Ralfs Brit. Desm. 

 1848, p. 220, t.XXXV, f. 12. 



Lat. 7/2; apicibus 51/2 inter se distantibus. 

 In stagnant water. 



Area: Europe, N. America, Burmah, Ceylon, Central China, Japan. 



33. C. Jenneri Ralfs Brit. Desm. 1848, p. 167, t. XXVIII, f. 6. 



Forma minor, membrana plerumque luteo-brunnea. 



Lat. 8,5 — 9/2; apicibus 55 — 60/2 inter se distantibus. 



Numerous examples of this small form were observed and almost 

 all of them possessed a yellowish-brown cell-wall. The proportion and 

 relative curvature were exactly those of CI. Jenneri Ralfs. 



Area: Europe, N. America, E. Africa. 



34. C. Cynthia De Not. Desm. Ital. p. 65, t. VII, f. 71; Gooke Brit. 

 Desm. p. 26 — 27. 



Lat. 10,5/2; apicibus 82 /i inter se distantibus. 

 In muddy ricefields. 



Area: Europe, N.America, E. Africa, Ceylon, Sumatra, New Zealand and 

 Australia. 



