ALG-E FROM CENTEAX. AFRICA. 881 SORASTRE^. 27. CcELASTRUM sPH^RicuM Niig. [C. NdgelU Eabh. Fl. Europ, Algar. iii. 79, pro parte.] Mwangadan Eiver, S. of Fuladoga. 28. C. Morns, nov. sp. (Fig. 4). C. coenobiis sphaBricis, e cellulis confertis 16 compositis ; cellulis globosis verrucosis, verrucis eraarginato-tmncatis in toto ambitu cellnlae uniuscujusque 9-10. Diam. coenob. 35-36 [i ; diam. cell. 9*5-10 /x. Mwangadan River, S. of Fuladoga. The nearest species to this is C. scabrum Reinsch (Contrib. Flor. Alg. Aq. dulc. Promont. Bonae Spei, Jouni. Linn. Soc. Bot. xvi. 232, pi. vi. fig. 3), from which it differs in the more crowded cells, which are ornamented with more numerous and distinctly emarginate warts. PROTOCOCCACEiE. 29. Glceocystis ampla (Kiitz.) Rabh. Flor. Europ. Alg. iii. 29. Mwangadan River, S. of Fuladoga. 30. G. RUPESTRis (Lyngb.) Eabh. I. c. 30. Mwangadan River, S. of Fuladoga. 31. Rhaphidium polymorphum Fresen. var. aciculare (A. Br.) Eabh. I. c. 45. Mwangadan Eiver, S. of Fuladoga. 32. ScENEDESMus OBLiQuus (Turp.) Kiitz. 8. acutus Meyen; Ealfs, Brit. Desm. 191, tab. 31, fig. 14. Mwangadan Eiver, S. of Fuladoga. 33. S. QUADRicAUDA (Turp.) Breb. ; Ealfs, I. c. 190, tab. 31, fig. 12 a-f. Mwangadan Eiver, S. of Fuladoga. SCYTONEMACE^. 34. ScYTONEMA sp. Crass. fil. 18-20 /a; crass, trich. 10-11 fx; heterocyst. 10 x 11*5-13 /a. G. Laschan, Leikipia. SiROSIPHONIACE-E . 35. NoSTocHOPSis LOBATus Wood, Prodr. Freshw. Alg. N, Amer. 127 ; Contrib. Hist. Freshw. Alg. N. Amer., Smithsonian Contrib. to Knowledge, 44, tab. iii. fig. 6; Bornet et Flahault, Bevis. dd Nostoch. Heterocyst. iii. 80. Crass, fil. infer. 2 /x; crass, cell. sup. 3*5-4'5/a; diam. heterocyst. 6-8 /x (Figs. 1-2). Inkuyuni, Kamassia. The cells of the plants examined were rather smaller than the average for this species ; all the heterocysts were lateral, and mostly stalked. The figures given by Wille [Bidrag til Sgdamerik. Algfl. tafl. 1, f. 1-19) show much slighter intercellular constrictions, and the branching seems very different to that of the African plant. Lyngb YE^. 36. OsciLLATORiA LiMOSA Ag. [OsciUciria Frcelichii Klitz. ; 0. nigra Ag.] Crass, fil. 15-15*5 /x. Mwangadan Eiver, S. of Fuladoga. 37. Arthrospira platensis (Nordst.) Gomont, Monograjjh. des Oscillar. 267, pi. vii. fig. 27. Spirulina Jenneri Hass. fi. platensis Nordst. in Wittr. et Nordst. Alg. Aq. Dulc. Exsicc. fascio. xiv.
