186 MR. б. S. WEST ON THE FRESHWATER ALG 
Genus TETRAPEDIA, Reinsch. 
353. TETRAPEDIA REINSCHIANA, Arch. in Grevillea, 1. (1872) р. 46, t. 3. 
figs. 11-18. 
Nyasa.—On shore, Domira Bay (19 June, 1904; no. 17). In swamp, 
Karonga (2 July, 1904 ; no. 34). 
394. TETRAPEDIA GLAUCESCENS, (Witr.) Boldt.— Arthrodesmus ? glau- 
cescens, Wittr. т Bih. К. Sv. Vet.- Ak. Handl. (1872) no. 1, p. 55, t. 4. 
fig. 11. 
Nyasa.—In scrapings from bottom of s.s. * Guendolen' at anchor S. end of 
lake (15 June, 1904; по. 577). Swampy lake margin, Domira Bay 
(19 June, 1904 ; no. 579). 
Тапрапу! Ка. — [п swamp, Kituta (23 Aug. 1904 ; n. 72). 
Genus GOMPHOSPHL.ERIA, Kitz. 
855. GOMPHOSPHJERIA APONINA, Kütz. Tab. Phye. 1. t. 31. fig. 3; Rabenh. 
Fl. Europ. Alg. ii. (1865) p. 56. 
Tanganyika.—In plankton, off Niamkolo Island (29 July, 1904 ; no. 36). 
Among Cladophora on shores, Niamkolo (1 Aug. 1904 ; no. 44). In plank- 
ton, Vua Harbour (29 Oct. 1904; no. 150). 
356. GOMPHOSPHERIA LACUSTRIS, Chodat, in Bull. Herb. Boiss. vi. (1898) 
pp. 180-182, cum fig. 1. 
Nyasa.—ln plankton, off Karonga (1 July, 1904 ; no. 30). 
Victoria Nyanza.—In plankton, near Bukoba (21 April, 1905 ; no. 252). 
Genus MICROCYSTIS, Kütz. 
357. Microcystis JERUGINOSA, Kitz. Tab. Phye. i. t. 8.— Polycystis 
eruginosa, Kütz. Clathrocystis sruginosa, Henfrey, in Journ. Mier. Sci. 
(1856) p. 58, t. 4. figs. 28—86. 
Nyasa.—In plankton, near Mtangula (22 June, 1904; по. 20), off 
Vahambwera Point (24 June, 1904 ; no. 24), and off Karonga (1 July, 1904 ; 
no. 30). 
Victoria Nyanza.—In plankton, near Bukoba (April 1905 ; nos. 249, 250, 
and 252). 
858. Microcystis viribis, (A. Br.) Lemm. т Abh. Naturh. Ver. Bremen, 
xvii. (1903) p. 342.—Polyeystis viridis, А. Br. in Rabenh. Alg. no. 1415 ; 
Rabenh, Fl. Europ. Alg. ii. (1865) p. 53. 
Nyasa.—In plankton, Anchorage Bay (13 June, 1904 ; no. 9). 
Victoria Nyanza.—In plankton, near Bukoba (21 Apr. 1905 ; no. 252). 
359. Microcystis prasina, ( Wittr.) Lemm. in Arch. Botanik К. Sv. Vet.- 
Akad. Bd. ii. (1904) no. 2, p. 146.—Polycystis prasina, Wittr. in Wittr. § 
Yordst. Alg. Fasic. 1879, по. 297. 
Nyasa.—In swamp, Karonga (2 July, 1904 ; no. 33). 
