132 BIOLOGY OF THE RICHMOND RIVER, 



are formed from this one by the agglomeration of the diffused 

 amylum into granules at the septa, thus leaving the protoplasm 

 clear and pellucid. The apices are generally truncate or rounded, 

 but this is the case to a greater or less extent with all the forms 

 of 0. splendida. 



Forma clarescens, n.f. (PL vi., f.7). 



Fila diam. 2-3, apicibus rotundatis, cell. alt. 4 /x, granulis 

 minutis singulis, utrinque ad dissepimenta; et dissejmyientis et 

 granulis difficile cerne7idis ob protoplasma amylo spisso. 



Lismore, in Lynghya stratum (24). 



Forma (PL vi., f. 8). 



Fila minutissima incipientia, epiphytica vel sessilia, basi affixa. 

 Cytoplasma pallide caeruleum homogeneum. 



Long. fiL incip. 10, 12, 14, 17, 18, 50; lat. 2-4 /x. 



Lismore (13, 16, 17). 



These incipient filaments were noted in fresh samples both 

 epiphytic on Oedogonium, and sessile on flocculent matter. They 

 also made their appearance on the sides of glass-jars in which 

 samples were kept, vide PL vi., f.8c, where green cells have 

 been deposited first, and these incipient Oscillatoria filaments 

 have become epiphytic upon them. They must, therefore, be the 

 outcome of motile cells or of micro-zoospores (see note under 

 Plectonevia, supra). They certainly develop into filaments of 

 var. amylacea, PL vi., f.8o?. 



Oscillatoria tknuis Ag. (PL vi., f.9). 

 Fila diam. 9 /x, cell, alt 4 /x. Cf. Gomont, P1.7, f.3. 

 Casino (14). 



Var. CHLORiNA, n.var. (PL vi., f.lO). 



Fila clare luteo-viridia, diam. 7 /x, vagina observata tenuissima; 

 cellulis disjunctis alt. 3-4 /x; dissepimentis baud granulatis. 



Lismore (22). 



Trichomata diam. 5/x ad genicula constricta, cellulis conjunctis 

 alt. 4 /x. Dissepimentis haud granulatis. 



Casino (14). 



