— 164 — 
23. P. minutissimum Nordst. in Acta Univ. Lund. 1873, tom. IX, 
p. 46, t. 1, f. al. 
Long. 17 w; lat. 10,6 p. 
In stagnant water in riverbed. 
Area: Europe, Madagascar, Burmah. 
24. P. inconspicuum West in Journ. Roy. Micr. Soc. 1894, p. 4, 
t. 1, f. 6,7. 
Long. 17; lat. 6p. 
Amongst other Desmids in stagnant water. 
Area: Europe and N. America. Ceylon. 
Closterium Nitzsch. 
25. . prelongum Bréb. in Mém. Soc. Scient. Nat. Cherbourg, 1856, 
IV, p. 152, t. 11, f. 41. 
Long. 459—625 w; lat. 16,5—18 u. 
In stagnant water in the jungle. 
Area: Europe and N. America. New Zealand (forma). 
26. (. acerosum Ehrenb. in Abhandl. Akad. Wissenschaft. Berlin 
1831, p. 68; Ralfs Brit. Desm. 1848, p. 154, t. XXVII, fig. 2. 
Forma apicibus truncatis; membrana luteo-brunnea,. subtilissime 
striolata. Long. 436—-583 »; lat.45 2; lat. apic. 8—9 4. (Tab. nostr. 
Il, fig. 5.) Diam. zygosp. 87 yp. 
The apices were much more truncate than in var. truncatum Gutw. 
(in Spraw. Kom. fizyjogr. Akad. Umiej. Krakow. 1891, p. 33, t. 1, f. 7); 
in fact, Gutwinski’s variety appears to be very little different from the 
typical form. 
Area: Ubiquitous. 
27, (.Lunula Nitzsch 1817; Ralfs Brit. Desm. 1848, p. 163, t. XXVII, 
f.1. Vibrio Lunula Miller 1784. 
Var. sublanceolatum Klebs in Schrift. phys.-oekon. Gesellsch. Kénigs- 
berg V, 22, 1879, p.6, 1, Rileet f 
Forma minor, cellulis paullo angustioribus; membrana lutea, glabra. 
Long. 282 w; lat. 32,5; lat. apic. 8,5. 
This form approaches very closely to the plant mentioned and figured 
by Gutwinski as Cl. acerosum Ehrenb. forma (Roypraw. Wydz. matem.- 
prayr. Akad. Umiej. Krakow. 1896, tom. XXXII, p. 36, t. V, f. 6). 
Area of type: Europe, N. and S, America, E. Africa, India, Central “Asia, 
Japan, New Zealand and Australia. 
28. (. Ehrenbergii Menegh. Synops. Desm. in Linnea 1840, p. 232; 
Ralfs Brit. Desm. 1848, p. 166, t. XXVIII, f. 2. 
