BY G. I. PLAYFAIR. 525 



grown before aplanospores can be developed. Their formation is 

 due more to external circumstances (probably temperature) than 

 to any maturity of the cell. In half -grown cells(Pl. liii., figs. 29, 

 30, 34, 37) generally only two aplanospores are produced, with 

 considerable variation in the shape. With the form from Botany, 

 PL liii., f.37, compare PI. liii., f.34, in which may be seen the same 

 form (var. acuminata) with two aplanospores, 7x4, having the 

 oblong shape of L. yenevensia. 



Var. CRISTATA, n.var. (PI. liii., f.21). 

 Cellula globosa, utroque polo setis 5-8 deorsum curvatis, assur- 

 gentibus instructa. Cell. diam. 12 /x. 



Var. STRIOLATA, n.var. (PI. liii., f.22-25). 



Cellulse oblongse vel ovales, trans vei'se striolatse vel costatse 

 (striis9-ll vel costis 6); setis 5-8 debilibus late-patentibus in- 

 structse. 



Cell. long. 11-18; lat. 7-9 /x. 



Var. coMOSA, n.var. (PI. liii., f.26). 



Cellula ovalis; fills pituitosis longissimis 5-8, utroque polo 

 ornata. 



Cell. long. 6; lat. 5; fil. long. circ. 80 /x. 



Genus Golenkinia Chodat. 

 GoL. radiata Chodat. 



Diam. cell. 14; long. set. 24 /x. 



Not noted in the Sydney Water-Supply, but found in a plank- 

 ton gathering from the Parramatta River (fresh). 



Var. PAUCisPiNA(W. & G. S. West) mihi. (PI. liii., f.39). 

 Diam. cell. 20; long. set. 3-12 /x. 



Var. australis, n.var. (PI. liii., f.40). 

 Cellulse globosse; setis brevibus sparsis, primo rectis, postremo 

 bifidis. 



Diam. cell. 18; long. set. 7 /x. 



I do not consider that there is anything specifically character- 

 istic in the length or number of the sette in Golenkinia. Com- 

 pare Lagerheimia ciliata var. comosa with the type. 



