172 MR. G. S. WEST ON THE FRESHWATER АТС Ж 
Tanganyika.—A mong various Algæ, floating, Komba Bay (10 Nov. 1904 ; 
no. 134). | 
The spores of this species were not observed, but it differs so much from 
previously described plants of this genus that I feel justified in naming it 
Nodularia tenuis. 
The trichomes are thinner than those of N. Harveyana, (Thw.) Thur., the 
cells are rounded quadrate, and the apical cells are acutely conical. The 
heterocysts are very numerous, broadly elliptical in form, and situated about 
110-120 и apart. 
297. NODULARIA sp. 
Crass. cell. veget. (trich.) 6-7 ш; crass. heterocyst. 10-11 ш; sporis non 
vidis. 
Nyasa.— [п shore-pools, Nkata Bay (23 June, 1904 ; no. 22). 
298. NODULARIA sp. 
Crass. trich. 4—45 ш; cellulis depresso-quadratis ; heterocystis late 
ellipticis, long. 7:5-9 ш, lat. 6-7 ш; cellula apicali hemisphzrica; sporis 
non vidis. 
Tanganyika.—A mong Cladophora sp., on stones, shells, roots of grasses, 
etc., Niamkolo (1 Aug. 1904; no. 44). 
Genus CYLINDROSPERMUM, Kitz. 
299. CYLINDROSPERMUM GOETZEI, Schmidle, in Engl. Bot. Jahrb. xxx. 
(1902) р. 245, t. 4. fig. 5. 
Crass. trich. 2:2-3 и; cellulis diametro 11-2-plo longioribus ; long. 
heterocyst. 8-9 ш ; lat. heterocyst. 3—3°8 №; long. spor. 19-28 y ; lat. spor. 
6:2-9:2 y. 
Tanganyika.—In swamp, Kituta (23 Aug. 1904; по. 12). 
This characteristic species was abundant in stagnant water. It is chiefly 
remarkable for its narrow trichomes and the length of the heterocysts. 
Family OSCILLATORIACEJE. 
Subfam. VAGINARLE.E. 
Genus SCHIZOTHRIX, Kiitz. 
300. ScHIZOTHRIX LACUSTRIS, А. Br. in Ка. Sp. Alg. (1849) p. 320; 
Gomont, in Ann. Sci. Nat. 7° sér., Bot. xv. (1892) p. 301, t. 6. figs. 9-12. 
Crass. trich. 1:2-1:4 д. 
Tanganyika.—On rocks, in a few fathoms, Niamkolo Harbour (9 Aug. 
1904 ; no. 54). 
