OF THE THIRD TANGANYIKA EXPEDITION, 131 
Genus SPH EROZOSMA, Corda. 
138. SPHJEROZOSMA EXCAVATUM, Ralfs, in Ann. Nat. Hist. xvi. (1845) 
р. 15; Brit. Desm. (1848) p. 67, t. 6. fig. 2. 
Nyasa.— Plankton, Anchorage Bay (11 June, 1904 ; no. 5). 
Genus HYALOTHECA, Ehrenb. 
139. HvaLoTH&ECA MUCOSA, (Dillw.) Ehrenb. т Bericht Berlin (1840), 
р. 212; Ralfs, Brit. Desm. (1848) p. 53, t. 1. fig. 2.—Conferva mucosa, 
Dillw. (1819). 
Tanganyika.—Plankton, Mbete (28 Sept. 1904; no. 105). 
Plankton, 
Lofu River (5 Oct. 1904 : nos. 123 and 124), very abundant. 
Order PROTOCOCCOIDE A. 
Family VOLVOCACEZ. 
Genus PANDORINA, Bory. 
140. Panporina мовом, (0. F. Müll.) Bory ; Rabenh. Fl. Europ. Alg. Ш 
(1868) p. 99 ; Cooke, Brit. Freshw. Alg. t. 27. fig. 2. 
Nyasa.—Swampy lake margin, Domira Bay (19 June, 1904 ; no. 579). 
Victoria Nyanza.—Swampy pools, Bukoba (20 Apr. 1905; no. 251). 
Family СНАВАСТЕЖ. 
Genus CHARACIUM, A. Br. 
141. CHARACIUM LONGIPES, Rabenh. Alg. Sachs. no. 171 (1852) ; FI. Europ. 
Alg. iii. (1868) p. 85. 
Long. cell. 28:5-31 ш; lat. cell. 6-7 ш; long. stip. 12-5-18 p. 
Victoria Nyanza.—Swampy pools, Bukoba (20 Apr. 1905 ; no. 251). 
142. Cuaracium Рвгхавнкмп, А. В». Alg. Unicell. p. 106 (1855); Rabenh. 
1. e. p. 86. 
Long. cell. cum stip. brev. 34 ш; lat. cell. 11 p. 
Victoria Nyanza—Among Utricularia, near Entebbe (1 May, 1905; 
no. 620). 
Family PLEUROCOCCACEZE. 
Genus TROCHISCIA, Kiitz. 
143. TRocHISCIA ACICULIFERA, (Lagerh.) lansg. in Hedgwigia, xxvii. 
(1888), p. 129.—Acanthococcus aciculiferus, Lagerh. 
Diam. cell. sine spin. 14 шь; long. spin. 2°5 д. 
Nyasa.—In swamp, Karonga (2 July, 1904; no. 34). 
