176 MR. Gd. S. WEST ON THE FRESHWATER ALGJE 
and dredged from the bottom (19 Nov. 1904; поз. 170 and 171). In swampy 
pond, Mrumbi (27 Dec. 1904; no. 195). In swamp, Toa (10 Jan. 1905 ; 
no. 208). In plankton near Baraka (24 Feb. 1905 ; no. 240). 
316. PHORMIDIUM ANGUSTISSIMUM, И’. $ G. S. West, in. Journ. Bot. xxxv. 
(1897) p. 72. 
Crass. trich. 0*8 д. 
Victoria Nyanza.—Among Utricularia, near Entebbe (1 May, 1905; 
no. 620). 
Tanganyika.—In plankton, near Kala (19 Nov. 1904; по. 170). In swamp, 
Toa (10 Jan. 1905 ; по. 208). In plankton, middle of lake between Rumonge 
and Uvira (30 Jan. 1905 ; no. 218). Among Utricularia, mouth of Mala- 
garasi River (16 Jan. 1905 ; no. 611). 
317. PHonMIDIUM Совгом, (Ag.) Gomont, in Morot, Journ. de Bot. iv. 
(1890) p. 355; Ann. Sci. Nat. 1° зег., Bot. ху. (1892) p. 172, t. 5. figs. 1, 2. 
Crass. trich. 3:8 д. 
Tanganyika.—On rocks below the water-level, Kassanga (10 Nov. 1904 ; 
no, 156). 
318. PHoRMIDIUM PAPYRACEUM, ( Ag.) Gomont, И. се. p. 355 ; р. 193, t. 5. 
figs. 3, 4. 
Crass. trich. 3:6 д. 
Tanganyika.—Epiphytic on Plectonema Wollei, Komba Bay (10 Oct. 1904; 
no. 134). 
319. PHoRMIDIUM INUNDATUM, Kütz. Sp. Alg. (1849) p. 251; Tab. Phyc. 
1. p. 32, t. 45. fig. 3; Gomont, l. c. (1892) p. 172, t. 4. figs. 31, 32. 
Crass. trich. 3—4:3 р. 
Nyasa.—In swamp, Karonga (2 July, 1904 ; no. 33). 
320. PHoRMIDIUM AMBIGUUM, Gomont, l. с. (1892) p. 198, t. 5. fig. 10. 
Crass. trich. 5:5-6 p. 
Tanganyika.—On rocks dredged in 2 or 3 fathoms, Niamkolo Harbour 
(7 Sept. 1904 ; no. 87), and on rocks just below water-level, Kassanga 
(10 Nov. 1904 ; no. 156). 
321. PHORMIDIUM AUTUMNALE, ( Аф.) Gomont, 1. с. (1892) p. 187, t. 5. 
figs. 28, 24; J. Schmidt, in Bot. Tidsskr. xxii. (1899) pp. 348, 410.— 
Phormidium uncinatum, (Ag.) Gomont, 1890; /. с. (1892) p. 184, t. 5. 
figs. 21, 22. 
Crass. trich. 5:8-6:2 д. 
Tanganyika.—On rocks, shallow water, Mbete (29 Sept. 1904 ; no. 114). 
