158 MR. G. S. WEST ON THE FRESHWATER ALGÆ 
Family GOMPHONEMACEZ. 
Genus GOMPHONEMA, 44. 
239. GoMPHONEMA PARVULUM, Avitz. Васі. p. 83 (1844) ; Van Heurck, 
Synops. Desm. Belg. p. 125, t. 25. fig. 9. 
Nyasa.—On bivalve shells, Anchorage Bay (по. 11). On rocks, Deep Bay 
(25 June, 1904 ; no. 26). 
Tanganyika.—On rocks in shallow water, Mbete (29 Sept. 1904 ; no. 114). 
In plankton, Lofu River (5 Oct. 1904 ; no. 123). Among Algæ scraped 
from the bottom of Dr. Cunnington's dau (24 Jan. 1905 ; nos. 216 and 211). 
Var. MICROPUS, (Aütz.) Cleve, Synops. Мале. Diat. 1. (1894) p. 180.— 
G. micropus, Азиз. Bacill. (1844) p. 84. 
Victoria Nyanza.—On rocks, near Bukoba (17 Apr. 1905 ; no. 247). 
240. GOMPHONEMA ANGUSTATUM, Айг. l. e. p. 83 ; Cleve, 1. с. p. 181. 
Nyasa.—On stones, shores of Domira Bay (19 June, 1904 ; no. 17). 
241. GOMPHONEMA INTRICATUM, А. l. e. p. 87, t. 9. fig. 4. 
Nyasa.—On Cladophora, Anchorage Bay (no. 11). On rocks and in shore- 
pools, Nkata Bay (23 June, 1904 ; nos. 22 and 23). 
Var. VIBRIO, (мел) Van Heurck; Cleve, l с. p. 182.—G. Vibrio, 
Ehrenb. 
Nyasa.—On stones, shores of Domira Bay (19 June, 1904; no. 17). 
Swampy lake margin, Domira Вау (19 June, 1904 ; no. 579). 
242. GOMPHONEMA GRACILE, Ehrenb. Infus. p. 217 (1838): Cleve, l c. 
p. 185. 
Nyasa.—In swamp, Karonga (29 June, 1904 ; no. 32). 
Victoria Nyanza.—On rocks, near Bukoba (17 Apr. 1905 ; no. 247). 
Var. DICHOTOMUM, ( W. Sm.) Van Heurck.—G. dichotomum, W. Sm. Brit. 
Dat. 1. р. 79, t. 28. Во. 240. 
Tanganyika.—In swamp, Kituta (23 Aug. 1904 ; no. 72). 
243. GOMPHONEMA EXIGUUM, Айс. le. р. 84, t. 30. fig. 58 ; Cleve, Synops. 
Navic. Mat. 1. (1894) р, 188. | 
Victoria Nyanza.—On Algæ attached to rocks, near Bukoba (17 Apr. 1905 ; 
no. 247). 
Tanganyika.—In large numbers attached to decaying fragments of Clado- 
phora sp., in plankton off Niamkolo Island (29 June, 1904 ; no. 36). On 
Alge floating in Kituta Bay (26 Aug. 1904 : no. 79). Attached to Algæ 
scraped from bottom of Dr. Cunnington's dau (24 Jan. 1905 ; no. 217). 
This species appears to have been previously recorded only as marine in 
habit. 
