FRESHWATER PLANKTON AI ALE FROM CEYLON 
145 
Pleodorina. 
P. CALIFORNIA Shaw. Loc. 58. Distr. Eur., N. Amer., Ceylon. 
Palmellaceae. 
Nearly all benthic or even terrestrial. The only typical plankton 
representative was found in the Ceylon collections. 
Gl<eococcus A. Br. 
G. Schroeteri (Chod.) Lemm. Distinguished from other Dal- 
mellacem by the spherical form of its colonies; the closely-related 
G. mucosus A. Br. has definite colonies but of a less regular form. 
Gloeococcns Schroeteri Lemm. A. Tetraspora-condition. 
B, C. Eudorinella-condition. 
G. Schroeteri appears to reproduce in the plankton. The small colonies 
sometimes (especially amongst those collected in tank Borlasgama) 
closely resemble those of JEudorino or Eudorinella, from which they 
can he distinguished by their lack of flagella (see fig. 1, B& C). But 
in G. Schroeteri the cells are often not symmetrically placed. The 
colonies do not appear to reach the size recorded for other species, 
hut they frequently attain over 200 fi diam. in the material from 
tank Basawak-kulam, the larger colonies having an extremely striking 
arrangement of the cells in fours (see fig. 1, A). These colonies 
resemble those of Tetraspora lacustris Lemm., and were connected 
by all transitions with typical G. Schroeteri ; but staining with 
safranin or gentian violet failed to show any pseudocilia such as 
would be observable if the specimens belonged to Tetraspora. Lo.c. 1, 
4, 9, 11, 14, 56, 59. Distr. Temperate. 
(To be continued.) 
L 
Journal of Botany.—Vol. 61. [May, 1926.] 
