126 OOCYSTIS AND EliEMOSPHiERA, 



laminar chloroplast, or one in each half of the cell; pyrenoids are 

 often present. 



Var. NATANS (Lemm.) mihi. (PI. vii., f.i'l). 

 Cell. veg. long. 1 6, lat. 1 1 /'.. 

 Auburn. 



Syn., OocysteUa natans Lemm., Zeitschr. f. Fischerei, 11)03; 

 Plankt. 8chwed. Gewass., p. 156, T. i., f.ll, 12. A form of O. 

 lacustris with a lobed or fragmented chloroplast. No size is 

 given by the author in the latter publication, but his fig. 12 

 works out at 19 X 12//.. 



Var. PALUDEXSis, n.var. (PI. vii., f.22-24). 

 Formse typicye consimilis, chloroplastidibus autem fractis, in 

 laminis minutis radiantibus vel in massis digitatis ordinatis. 

 Cell, matric. long. 1 1 0, lat. Sf) ; autosp. 1 7 x 1 2, 20 x 1 2, 22 x 1 1 //.. 

 Canley Vale (128); Guildford (U6). 



These forms were found in small pools fed by surface-water. 

 They differ from the type and var. nntmis only in the character 

 of the • chloroplasts. In PI. vii., f.23, the original chloroplasts 

 seem to have broken u}) into small, radiating laminie, while in PI. 

 vii., f.24, the chloroplasts are small, digitate masses, as in O. 

 ovalis, pointing away from the centre, and towards the pole in 

 each half. A pyrenoid(]) is present in the centre of each half, 

 sometimes pale green, sometimes pale brick-red in colour. Com- 

 paie remarks under O. oralis, infra. 



OocvsTis PARVA W. tt G. S. West. (PI. vii., f.25, 26). 



"(). miimta cellulis plerumque 



oblique ellipsoideis, 1^-lf-plo longioribus 

 quam latioribus, apicibus subacutis et non 

 incrassatis; membrana firma. Contentum 

 chlorophyllosum cellularum in massis pari- 

 etalibus 2-3." W. & G. S. West, Lc. 



Cell, matric. spher. diam. 12, 18, 24, 4-8 ; 

 O. pJmW^&!i S. oval. 30 X 22,54 x 42:autosp. 10 x 8,12 x 8/., 

 We.st,( X .-)2<)): after Sydney Water (63, 65); Guildford (84). 



(;. S. West. Qj-_ ^^Y. & G. S. West, Notes on Fresh- 



water Algie, i., Journ. Bot., 1898, p.335; G. .S. West, Alga-Hora 



