72 DR. G. S. WEST ON THE ALGÆ OF 
Long. 21-24 и; lat. e. proc. 39-43 и; lat. isthm. 5—5°5 ш; crass. 9-9:5 p. 
flab, Yan Yean Reservoir, at the weedy margins (July, Nov., and Dee. 
1905 ; Jan. 1906). 
This small species, which occurred abundantly in November and December, 
appears at first sight to have no very distinctive peculiarities. It is most 
nearly related to Staurastrum undulatum, W. & G. S. West (in Trans. Linn. 
Кос. ser. 2, Bot. v. (1895) p. 78, t. 8. fig. 37), and S. exile, W. & G. В. 
West (1. с. fig. 88), two species described from Madagascar, but is larger than 
either of them, with more finely nolulose processes, a more expanded apical 
region of the semicells, and a fusiform vertical view. 
S. Hardyi was also frequent in a lagoon of the Yarra-Yarra River (Mar. 
1905). 
52. STAURASTRUM ASSURGENS, Nordst. in K. Sv. Vet.- Akad. Handl. Bd. xxii. 
no. 8 (1888), p. 37, t. 4. fig. 8. 
Var. VICTORIENSE, var. п. (Pl. 6. fig. 17.) 
Var. minus, verrucis dorsalibus majoribus prominentioribusque ; semi- 
cellulis a vertice visis angustioribus, sine tumore utrobique. 
Long. 35-37 ш; lat. eum proe. 75-80 р; lat. isthm. 75-85 p; crass. 
1675 р. 
Hab. Yan Yean Reservoir, somewhat rare in the plankton, but abun lant 
at the weedy margins (1905-6). 
А curious monstrosity of this variety was observed which possessed four 
" semicells "^ united at а central point. Each “ semicell was quite normal 
in character, and the monstrosity is unique. The specimen was fully grown 
and I ean offer no suggestion as to its origin unless it represents an abnormal 
growth from a zygospore. It would appear impossible for cell-division in 
the Desmidiaceæ to give rise to such a monstrosity. 
—— Forma major ; processibus elongatis et patentioribus. 
Long. 57 д ; lat. c. proe. 148-160 м. (PI. 6. fig. 18.) 
Only two specimens of this large forin were seen amongst а multitude of 
smaller ones. 
It should be mentioned here that Playfair (Proe. Linn. Soc. N. S. Wales, 
xxxii. (1907) p. 192) has expressed some extraordinary views about “ young 
forms" of 5 assurgens which are contrary to all known facts concerning 
the Desmidiaceæ. 
53. STAURASTRUM INDENTATUM, W.  G. S. West, in Trans. Linn. Soc. 
ser. 2, Bot. vi. (1902) p. 186, t. 22. figs. 10-12, 
Forma dorso semicellularum minus dentato ; semicellula a vertiee visa 
paullo angustiore. 
Long. 38-41 p ; lat. c. proc. 65-73 ш; lat. isthm. 8-075 u ; crass. 12 p. 
