382 ALG^ FROM CENTRAL AFRICA. no. 679. Crass, fil. 7-7-11-5 /*; long. cell. 3-8-5-5 /x; diam. spir. 42-46 }x anfractibus 40-48 /a inter se distantibus (Figs. 5-6). Lake Losuguta (water with sulphides). This is a most interesting alga, having been recorded hitherto only from Uruguay. The African plant is a little stouter, and has the spirals somewhat closer together; the habitat water with sulphides " is also remarkable. Chroococcace^. 88. Chroococcus turgidus (Kiitz.) Nag. Gatt. Einzell. Alg. 46 ; Eabh. Fl. Europ. Alg. ii. 32. Protococcus turgidus Klitz. Tab. Fliyc. i. 5, t. V. f. 1. Diam. cell, sine integ. 5'5-9*5 x 10-5-17-5 ^i, cum integ. 15-25 x 20-29 /x. Mwangadan Kiver, S. of Fuladoga. 39. Ccelospheerium confertum, nov. sp. (Fig. 3). C. tballo globoso parvo ; celluUs minutis periphericis, subglobosis angulari- globosisque, plerumque quaternis, confertis. Diam. thall. 125 ix ; diam. cell. l'8-2-4 /z. Mwangadan River, S. of Fuladoga. 40. Merismopedia glauca (Ehrnb.) Nag. Gatt. Einzell. Alg. 55, t. i. D, f. 1; Eabh. Fl. Europ. Alg. ii. 56. Diam. cell. '2 /x. Inkuyuni, Kamassia. 41. M. PUNCTATA Meyen ; Rabh. I.e. 57. Diam. cell. 4-4*5 /x. Mwangadan River, S. of Fuladoga. DlATpMACE^. 42. SuRiRELLA ovALis Brcb. (W. Sm. Brit. Diat. i. 33, t. ix. fig. 68). Mwangadan River, S. of Fuladoga. 43. S. ANGUSTA Klitz. [S. apiculata W. Sm. Brit. Diat. ii. 88, N. 24] . Inkuyuni, Kamassia. 44. Cymatopleura Solea W. Sm. {I. c. i. 36, tab. x. fig. 78). A broad form ; long. 138 /x ; lat. max. 45 /x. Inkuyuni, Kamassia. 45. Epithemia gibba Kiitz. (W. Sm. I. c. 12, tab. i. fig. 13). Mwangadan River, S. of Fuladoga. Inkuyuni, Kamassia. 46. E. soREx Kiitz. (W. Sm. I. c. tab. i. fig. 9). Mwangadan River, S. of Fuladoga. Inkuyuni, Kamassia. 47. E. VENTRicosA Klitz. (W. Sm. I. c. tab. i. fig. 14). Mwanga- dan River, S. of Fuladoga. Inkuyuni, Kamassia. 48. EuNOTiA PECTiNALis Dillw. ', Rabh. FL Europ. Algar. i. 73. [Rimantidium pectinale Kiitz. ; W. Sm. Brit. Diat. ii. fig. 280.] G. Laschan, Leikipia. Lake Losuguta. Var. UNDULATA (Sm.) Ralfs; Rabh. Fl. Europ. Alg. i. 74. [Hi- mantidium undulatum W. Sm. Brit. Diat. ii. fig. 281.] G. Laschan, Leikipia. 49. Cymbella Gregorii Ralfs (Pritch. Infus. 876 ; Rabh. Fl. Europ, Alg. i. 79). Mwangadan River, S. of Fuladoga. 50. 0. VENTRICOSA Ag. (Rabh. I. c. 82). Forma dorso subelato- convexa. G. Laschan, Leikipia. 51. Cocconema cymbiforme (Kiitz.) Ehrnb. (W. Sm. Brit, Diat. tab. xxiii. fig. 220). G. Laschan, Leikipia. Lake Baringo.
