338 FRESHWATER ALG^ OF LISMORE DISTRICT, 



Hall. Stein's figure would seem to suggest a mucous investment; 

 probably, however, it is merely an incrassate membrane. The 

 integument of our specimens is quite thin, and appeared to be 

 membranous. Stein gives two contractile vesicles at the base of 

 the flagella, as in Chlamydomonas] but my observations showed 

 several, at least three, at intervals round the anterior margin. 

 The flagella, also, were more widely apart than I have ever seen 

 them in any bi-flagellate form. The difference in the cell-con- 

 tents is merely a matter of nutrition. A central nucleus, x 3 /x, 

 was noted. 



Var. SUBRENIFORMIS, n.var. (PI. xliii., f.5, 6.) 



Cellulse subreniformes, fronte planse, a tergo subreniformes 

 depressse, in coenobii ambitu circa 12-15; ceteris ut in f. typica. 



Coen. subsphser. long. 88-126, lat. 78-94; sphaer. diam. 110-114; 

 cell.diam. 10-14, inter se distant. 6-8 /x. 



Lismore (246). 



Cf. Eudorina elegans Stein, l.c.^ T. xvi., f.9, peripheral cells. 

 This form was gathered in abundance from the same place as the 

 type, but a month later (July 8th, 1914). 



Var. PARViCELLULA, n.var. (PI. xliii., f.7-9.) 



Ccenobium plerumque minus interdum minimum; cellulis ut in 

 f. typica vel in var. suhreniformi sed minoribus. 



Coen. subsph. long. 64-100, lat. 60-90; cell. diam. 6-8 /x. 



Coen. sphser. diam. 20-64; cell.diam. 5-6, inter se distant. 8-1 2 /x. 



Lismore (244, 246). 



This variation was formed to include the small spherical coeno- 

 bia with cells J size of the type, of which any quantity were ob- 

 served, of all dimensions. Coenobia were occasionally noted, 

 however, of almost the largest size, with cells just as small; and 

 both in coenobia, and in cells, a complete series was exhibited, 

 from the very smallest to the very largest. Cells of two sizes 

 were often present in the same coenobium. 



Var. LENTICULARIS, n.var. (PI. xliii., f.lO.) 



Cellulae paucse, latissimse, lenticulares, integumento intus ad- 

 hserentes; ceteris ut in f. typica. 



Lismore (244). 



