OF THE THIRD TANGANYIKA EXPEDITION. 129 
134. STAURASTRUM ANATINUM, Cooke & Wills, in Journ. Quek. Mier. Club 
(1881), t. 15. figs. 12, 18; И’. д G. S. West, in Trans. Roy. Irish Acad. 
xxxil. sect. В (1902), p. 54, t. 1. figs. 24, 25. 
Var. SUBGLABRUM, var. п. (Pl. 6, fig. 8.) 
Var. eorpore semicellularum verrucis emarginatis pæne destituto ; pro- 
cessibus ut in forma typica. 
Long. sine proc. 42 ш; lat. sine proc. 24-27 ш; cum proc, 84-96 y ; lat. 
isthm. 11°5 y. 
Victoria Nyanza.—In plankton, Bukoba (21 Apr. 1905 ; no. 252). 
Only a few of the emarginate warts are present on the semicells of this 
variety, but the processes are quite characteristic of the species. 
135. STAURASTRUM LEPTOCLADUM, .Vordst. in Vidensk. Medd. Naturh. 
Foren. Kjób. 1869, p. 228, t. 4. lig. 51. 
Forma AFRICANUM, nob. (РІ. 6. fig. 12.) 
Forma paullo major, processibus subrectis et horizontaliter dispositis 
(parallelis), ad basin semicellulee cum dentieulis singulis vel binis ; apicibus 
semicellularum convexis et glabris ; semicellulis а vertice visis corpore lato 
elliptico-rotundato. 
Long. 42-43 ш ; lat. sine proc. circ. 11-21 и, cum proc. 146-152 и; lat. 
isthm. 6-7 ш; crass. 14 д. 
Nyasa.—In the plankton, near Mtangula (22 June, 1904; по. 20). 
Plankton, off Vahambwera Point (24 June, 1904 ; no. 24). Plankton, Deep 
Bay (24 June, 1904; по. 25). Plankton, off Karonga (1 July, 1904; 
no. 30). 
Victoria Nyanza.—In plankton, Bukoba (21 Apr. 1905; no. 252). 
This large form with horizontally-directed processes was frequent in the 
plankton of Nyasa and Victoria Nyanza. Schmidle mentions a form which 
is possibly identical with it as occurring in Stuhlmann's collections from 
Victoria Nyanza. 
A few smaller specimens of S. leptocladum were observed from Victoria 
Nyanza in which the processes were shorter, and the two spines at the 
extremity of each process disposed in a horizontal plane, the bifurcation only 
being apparent in the vertical view. 
136. STAURASTRUM LIMNETICUM, Schmidle, in Engl. Bot. Jahrb. xxvi. 
(1898) p. 52, t. 4. fig. 5. 
Long. sine proc. 46-51 р; lat. sine proc. circ. 28-36 м, cum proc. 100- 
130 w; lat. isthm. 14 м. (РІ. 3, figs. 8-10, 20.) 
Victoria Nyanza.—Abundant in the plankton, Bukoba (18 Apr. 1905 ; 
no. 249, and 21 Арг. 1905 ; no. 252). 
LINN. JOURN,— BOTANY, VOL, XXXVIII, K 
