BY G. I. PLAYFAIR. 97 



Desmidiacece 10, Bacillariefp, 32, Myxophycem 13, Chytridiacem 4, 

 Schizomycetes 4, Infusoria 4, Rltizopoda 10. 



CHLOROPHYCE^. 



Genus Geminella Turpin. 

 Geminella interrupta var. cylindrica, ri.var. (PI. iii., f.3l ). 



Cellulse cylindraceae adpiessae, ad geiiicula coiistrictie: chloro- 

 plastidibus crassis parietalibus, totam cellulam compleritibus, 

 utroqiie polo macula miiiuta nigra. 



Diam. cell. 6, alt. 6-10 /x. 



Lismore (206). 



Genus Spirogyra Link. 

 SpiROGYRA MAXIMA (Hassal) Wittr. 



Lat. cell. veg. 108-130; cell. alt. 120-340; niembr. crass. 1-4 /x. 



Zygospora a fronte visa exacte circ, diam. 110-112; subcirc, 

 long. 112-136, lat. 100-116; crass. 84-92 /x. 



Lismore (12, 16, 20, 21). 



Syn. Sp. orbicularis (Hass.) Kiitz., in Petit, Spirog. de Paris, 

 p.31, PI. xii., f.l, 2. I have never found this species before, but 

 it is the characteristic Spirogyra of the River at Lismore, being 

 found in quantity almost anywhere. The breadth of the vegeta- 

 tive cells is generally 120/z. The chloroplasts are six in number, 

 making J to 1 turn each. The dimensions here given, unite the 

 forma tenuior Magn. et Wille, in Wille, Sydamer. Algfl., p. 34 

 with the type as recorded by Petit, I.e., p. 31. It seems also very 

 probable that the Sp. seti/ormis f. minor, zygotis lenticularibus 

 Magn. et Wille, is a form of Sp. maxima, as Mobius (Austral. 

 Siissw., ii., p.334) has recorded the latter from the Darling 

 Downs, Queensland, at still lower dimensions. Petit gives the 

 zygospores of Sp. seti/ormis as elliptic, not lenticular, and the 

 cell-membrane of S]). maxim,a, as observed by me, was just as 

 often stratified as not. A few filaments (diam. 120 /x) were noted 

 with extremely long cells, yet in perfect condition. The cells 

 varied in length from 1026 to 1035/x, and contained six chloro, 

 plasts making three complete turns each (20). 



