518 PLANKTON OF THE SYDNEY WATER-SUPPLY, 



Var. Crux MiCHAELi(Reinsch) mihi. (PI. Ivi., f.6). 

 Cien. lat. 20-25 fx. 

 Duckpond, Botanic Gardens. 



Syn., Tetrapedia Crux Michaeli Heinsch, Mittelfr. p.38,T.i.,f.vi. 

 The hyaline spaces between the cells are sometimes wanting, 

 the cells being contiguous. 



Var. iNTEGRUM(Nag.) mihi, forma. (PI. Ivi., f.7). 



Cdniobium crucigenisefoime medio lacuna oblonga parva in- 

 structum. 



Cellulis 4 plus minus cordiformibus, marginilms exterioribus 

 concavis, angulis exterioribus interdum minuto apiculo prteditis. 



Long. 25, lat. 23 /i. 



Duckpond, Botanic Gardens. 



Genus 8cnNKDKSM(JS Meyen. 

 So. OBLIQUUS var. ACUMiNATUS(Lag.) Chod. (PI. ivi., f.8). 

 Cellulte endochroma homogenea dilute cterulea impletaj, pyre- 

 noidibus singulis minutis instructae. 



Cten. long. 22-30, lat. 16-24; cell. lat. max. ^ fx. 

 Cf. Bernard, Protococc. et Uesm., PI. xiv., f.422. 



Var. iNERMis, n.var. (PI. Ivi., f.9). 

 Forma cellulis omnibus oblongis perfecte rectangularibus, in- 

 terioribus paullo longioribus. 

 Ccen. long, 16, lat. 16 /x. 



Genus Oocystis Nag. 



Ooc. PARVA W. & G. S. West, Journ. Bot. xxxvii., 1899, PI 394, 



f.14-17. 

 Ccen. oblong, long. 54, lat. 42; cell. long. 10, lat. 8/^. 

 Ccen. globes, diam. 12, 18, 24, 48; cell. long. 12, lat. S /x 



Genus Nephrocytium Nag. 

 N. Agakdhianum var. ALLANTOiDKUM(Bohlin) Chodat. 

 Coenobium interdum cellulis 8 geminatis dispositis. 

 C(Kn. 4 -cell. diam. circ. 25; 8-cell. long. 36, lat. 28 /x. 

 Cell.long. 10-14, lat. 2-3 /x. 



