BY G. I. PLAYFAIR. 



135 



OOC'YSTIS AUSTKALIEXSI^, 11. Sp. (PI. viii., f.12,1.")). 



Celluke late elliptico-laneeolatai; lateribus sequaliter arcuatis 

 usque ad polos seiisini sensiuKjue convergentibus; apiculis acu- 

 niiiiatis liaucl incrassatis. Chloroplastides pulvinifonnes. 



Cell, matric. sphser. diani. 4(i, lanceol. 45 x. "^8; cell. veg. vel 

 autosp. 20 X 1 2, 20 X 1 4, 2 1 X 1 :\ 2:'. x 1 7, 24 x 1 4, 24 x 1 5, 27 x 1 8, 

 :'.0 X 17, :W x 20, :^0 x21/7.. 



Auburn (49, 57, 104, 105, 1:^5, 139); Collector; Lismore (185). 



Cy. Chodat, /.r., p. 189, f. 104G, H, for somewhat similar but 

 irregular forms. This species is another of our swamp-forms. 

 The cells are the shape of 0. lacustris Chod., but have discoid 

 chloroplasts, and a different habitat, 0. lacnstris being a plank- 

 ton-form. In optical section, there are nearly always five chloro- 

 plasts each side, and one at each end. The dimensions are 

 much the same as in 0. Chodati; in both also the axial ratio is 

 approximately 3:2. As autospores, they are generally found in 

 thin-walled, oval or lanceolate mother-cells, but I have noted them 

 produced by undoubted, uninflated specimens of Eremosphd'va 

 viridis, easily recognised by the irregular, mucilaginous, inner cell- 

 wall. See text-figure 3 in the introduction, and compare Chodat, 

 Bot. Zeit., 1895, PI. v., f.9. 



OOCYSTIS PANDURIFORMIS W. West. 



"O. magna; cellulis solitariis vel in famil- 

 iis e 4-8 cellulis formatis consociatis, cellu- 

 lis 2-2^-plo-longioribus quam latioribus, 

 ovatis, lateribus leviter concavis, apicibus 

 incrassatis et subacutis." W. West, I.e. 



Cell. veg. long. 82, lat. max. 30 /x. 



Rookwood (107). 



W. West, New Brit. Frw. Alg., J.R.M. 

 8oc., 1894, p.l5, PI. ii., f.33-35. A rare 

 form, of which I have seen only one speci- 

 men; the shape, however, is too charac- 

 teristic to be mistaken. West's dimen- 

 sions are 50-6 1^ long, by 23-25^ broad. A forma ma/ar West, is 

 distinguished by him in the same place, size: "long. cell. 77 [j.; lat. 



(PL viii., f.l4). 



Text-fig. 22. 

 0. 2)andurifonni>< W. 

 West,( xfyiO); after 

 W. We.st. 



