C.T-w. 



957. Staueastrum sexangulake, Lund., var. gemmescens, Playf. (x 740). 



958. Cymbella lanceolata, Kir din. (After Rabenhorst.) 



959. Synedea Acus, Kuets. (After Rabenhorst.) 



960. Cystopleura tuegida, Kunze. (After Rabenhorst.) 



961. C. gie-ba, Kunze. (After Rabenhorst.) 



962. C. gibberula, Kunze. (After Rabenhorst.) 



963. Lysigonium vaeians, De-Toni. 



965. Stilophoea ehizodes, /. Ag. 



966. Galaxauea obtusata, Lamour. 



967. Hypnea musciformis, Lamour. 



968. Amphieoa granifera, Harv. 



969. Plectonema Tomasinianum, Born. (After Cooke.) 

 070. Calothrix fusca, Born, et Flah. 



("a) Form with spherical single heterocyst, (b) do. with single pyriform heterocyst, 

 (c) do. with twin heterocysts, (d) the basal cells developing macrogonidia. (Aftei 

 Wolle.) 



3 E 



