128 MR. С. $. WEST ON THE FRESHWATER ALG 
Forma processibus minus divergentibus. 
Long. sine proc. 8 и, cum proc. 16 ш; lat. sine proc. 6 д, cum proc. 29 ш; 
lat. isthm. 2:5 д. 
Victoria Nyanza.—Among Utricularia, near Entebbe (1 May, 1905; 
no. 620). 
130. SrAURAsTRUM GRACILLIMUM, W. & G. S. West, т Trans. Linn. Soc. 
ser. 2, Bot. v. (1895) p. 75, t. 8. fig. 1. 
Forma 3-radiata. 
Victoria Nyanza.—Among Utricularia, in sheltered bay near Entebbe 
(1 May, 1905 ; no. 620). 
131. STAURASTRUM GRACILE, Аа, т Ann. Nat. Hist. ху. (1845) p. 155; 
Brit. Desm. (1848) p. 136, t. 22. fig. 12. 
Var. SUBORNATUM, Schmidle, in Engl. Bot. Jahrb. xxvi. (1898) p. 51, 
t. 4. Во. 1. 
Victoria Nyanza.—In plankton, Bukoba (18 Apr. 1905 ; no. 249). 
Var. PROTRACTUM, var. п. (РІ. 6, fig. 11.) 
Var. apice semicellulz protracto leviter retuso et glabro. 
Long. 29 w ; lat. sine proc. circ. 16 p, cum proc. 58-62 ш; lat. isthm. 7 д. 
Nyasa.—In plankton, Anchorage Вау (13 June, 1904 ; no. 9). 
Var. Nyansz, var. п. (РІ. 6. fig. 10.) 
Var. corpore semicellularum angustiore, ad basin inflato-bulboso, processibus 
incurvatis delicate noduloso-denticulatis. 
Long. 26 р; lat. sine proc. circ. 12 u, cum proc. 48 ш; lat. isthm. 4:5 y. 
Victoria Nyanza.—In plankton, Bukoba (18 Apr. 1905 ; no. 249). 
This variety is very near to S. gracile var. elegantulum, W. & G. S. West 
(in Trans. Linn. Soc. ser. 2, Bot. vi. (1902) p. 191, t. 22. fig. 20), but differs 
in the narrow and bulbous base of the semicells, and in the more incurved 
and more coarsely denticulate processes. 
132. STAURASTRUM LONGIRADIATUM, И” & G. S. West, in Trans. Linn. 
Soc. ser. 2, Dot. у. (1896) p. 267, t. 17. fig. 23. 
Victoria Nyanza.—Among Utricularia, near Entebbe (1 Мау, 1905; 
n. 620). 
133. STAURAsTRUM SuBMANFELDTH, W. 6: G. S. West, in Trans. Linn. 
Soc. ser. 2, Bot. vi. (1906) р. 188, t. 22. fig. 16. 
Victoria Nyanza.— With the preceding species (no. 620). 
Forma semicellulz a vertice visæ lateribus undulatis et denticulatis (verrucis 
emarginatis perreductis ornatis). 
Long. 38 ш; lat. cum proc. 52-60 ш; lat. bas. semicell. 13:5 ш; lat. 
isthm. 85 р. 
Nyasa.—In swamp, Karonga (2 Aug. 1904 ; no. 34). 
