94 Hardy, Alg^ of the Zoological Gardens, Melbourne, [vof^'xxx 



seen, and not preserved ; figure given is diagrammatic only ; length of 

 centre cells, 45-48 /<. ; external, between apices, 33-38 i^i. (PI. v., 

 fig. 6). 

 Selenastrum, sp. 



Only one plant seen, and lost sight of in attempt to mount. Not 

 measured, but of about the same cell length as the centre cells of the 

 foregoing species, and of proportion as shown in fig. 6. The four slender 

 arcuate cells, arranged back to back (cruciform in transverse section), 

 have their attenuated ends reflexed (PI. v., fig. 7). 



Closteridium Bengalicum, Turn., I.e., 158, PL 20, fig. 25. 



Only one cell seen, and resembling a single cell of Ank. quaternus in all 

 but the short spines of the blunt apices. Also something like Closterium 

 cuspidatum, as figured in Supplementary Plate XXXV., fig. u, by 

 Ralfs. (PI. v., fig. 2). 



DictyosphcBvium Ehrenhergianum, Nag. [G. S. West, I.e., p. 236, f. 104.] 

 Only three plants seen ; diam., 4 fi. 



Botryococcus Braunii, Kutz. [Cooke, I.e., p. 15, VII., f. 2 ; G. S. West, 

 I.e., p. 237, f. 106.] 



Palmella hyalina, Breb., " Alg. Fal.," p. 39. 



Cooke, I.e., p. 1 1 ; V., fig. 3 ; but against the sizes of cell there quoted 

 — viz., 0.5-1 j-i., Rabenh., .75-1 /<., Kirch. — the local specimens are 



3-4 M- 



Dr. G. S. West, I.e., p. 240, has influenced my identification, 

 after considerable hesitation, due to F. S. Collins, who, in his " Green 

 Algse of North America," * excludes from the genus all but P. miniata, 

 Leiblein, and its variety csqualis. Nag. The thallus is only to be seen 

 in its natural habitat, as it is too fluid to bear handling. Collapsed in 

 a phial, one measured i c. cm. Several measured in the water were up 

 to 40 mm. across the surface and about 7.5 mm. thick, and approximately 

 lenticular, few having escaped damage by wading birds. 



Fragillaria capueina, Desmaz. 

 Diatoma elongatum, Ag. 

 Synedra ulna (Nitzsch), Ehrenb. 

 Navicula viridis, Kutz. 



The diatoms were identified by means of Van Heurck's monograph. 

 The first three were plentiful in the fish ponds, and 22 was sparse in all 

 pools. 



Oseillatoria, sp. 



Scattered filaments only occasionally seen, 1.5 ^i. diam.; more slender 

 than O. tenuis, Ag., and with truncate — not attenuated — apices ; 

 possibly 0. angustissima, W. and G. S. West, of which I have no descrip- 

 tion, or an intermediate form. 



Merismopedia glauea (Ehrenb.), Nag. 



Thallus extensive — 2,500 cells — but mostly found in smaller fragments 

 of 32, 64, &c. ; 3.3-3.8 //. is the size of cells given by Dr. West for 

 above species. The plant from the Flamingo Pool and the Crane Pool 

 is similar to that of the Yan Yean reservoir (hitherto unrecorded), and 

 has cells of diameter .65 f-i. only (PI. v., fig. 8). 



Flagellata. 



Euglena spirogyra. " Poggendorfl's Annalen d. Physik, 1830, p. 508," 

 in Ehrenberg's " Die Infusionothierchen," Leipzig, 1838, p. 107, 

 PI. VII., f. 10. 

 Ehrenberg describes the colour of this organism in three languages 



* In Tuft's " College Studies " (1909), vol. ii.. No. 3, p. 137. 



