Contributions to Our Knoivledge of the Freshwater Algae of Africa. 33 
6. Gosmariiim caperise, De Toni, Sylloge Algarum, etc., i, 1899, p. 969, 
(Syn. : C. pyramidatum, Brcb., subsp. capense, Nordstedt, De Alg. nonnull. 
praecipue Desm., etc., Act. Univ. Lund, xvi, 1880, p. 6, Tab. I, fig. 8.) 
Samples 86, 158, 327. 
Long, cell., 90-117 /x; lat. cell., 69-84 /x; lat. istlim., 20-24 /x; crass., 
60 /X. In all cases the specimens were quite typical, the basal angles in front 
view being broadly rounded, the end-view broadly elliptical, and the 
membrane strongly punctate. This species has been recorded from the Cape 
by Nordstedt and Fritsch. 
7. Gos7narium ohtusatuin, Schmidle, Engler's Bot. Jahrb., xxvi, 1898,, 
p. 38 ; W. & a. S. West, op. cit., iii, 1908, p. 7, PI. LXY, figs. 13, 14. 
Samples 311, 312 (not uncommon). 
Long, cell., 60-64 /x ; lat. cell., 54-57 /x ; lat. isthni., 15-16 /x ; crass., 
21-24 /X. This species has been recorded by Schmidle from East Africa, by 
Gr. S. West from the Karoo, and by Fritsch from the Orange Free State. 
Fig. 12. — Cosmaritim quadratimi, Ealfs, var. africanum, F. E. Fritsch, nov. var. 
a, a', front-, h, side-, and c, end-views, x 750. 
8. Cosmarium quadratum, Ralfs ; W. & Gr. S. West, loc. cit,, p. 57, 
PI. LXX, figs. 6-8. 
Var, africanum, F. E. Fritsch, nov. var. (''forma apice leviter retuso, 
membrana levissime punctata," Fritsch, Alg. Cape Peninsula, Ann. S. Afr. 
Mus., ix, 1918, pp. 552, 553) (Fig. 12). 
Semicellulis apice leviter retusis, angulis basalibus evidenter productis 
lateribus convexis vel leniter concavis ; a latere visis in apicem paullo 
incrassatis. Membrana levissime punctata. Long, cell., 39-49 /x; lat. cell., 
21-25 /X ; lat. isthm., 11-12 /x ; crass. 14-15 /x. 
Sample 36 (rather rare). 
The outstanding feature of this variety is the retuse character of the 
apex, which is to be observed in all cases, though varying somewhat in depth. 
In side-view (Fig. 12, 6) the membrane at the apex of the semicell invari- 
ably appears thickened. The punctation of the membrane is rather faint. 
9. Cosmarium regnellii, Wille, Sydamerik. Algfi., etc., Bih. K. Sv. Vet.- 
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