BY G. I. PLAYPAIR. 825 



membrane. The cells, in front view, are very similar to the 

 form of C. mulfijilis described above, but slightly smaller. In 

 side-view, however, they are seen to be not globular but com- 

 pressed from front to back. The membrane is always pale brown, 

 and, under pressure, splits with a vitreous fracture, like the 

 lorica of Trachplomonas. The lorica in this species, though in a 

 solid piece, often breaks into two halves by an almost straight 

 line down the sides, simulating the two adherent valves of 

 Phacotns. PL lix., f.l8, shows the compressed shape of the cell, 

 and the overlap of the sides at the apex. 

 Var. ovALis, n.var. (PL Ivi., f.lS). 



Forma ovalis, circa dimidio major. Cell. long. 30, lat. 24/x. 



Lismore (263). 



Carteria australis, n.sp. (PL Ivi., f.9). 



Cellulse oblongje, fronte modice cuneatj>^, postice late-rotundat*; 

 lateribus leviter arcuatis. Membrana crassa. Cytoplasma dilute 

 viride, minute granulatum, chloroplastidibus nuUis distinctis nee 

 pyrenoidibus. Nucleus in media cellula globo cavo chloi-ophyll- 

 aceo circumcinctus. Flagella 4. 



Cell. long. 30, lat. 17; glob, chlorophyll, diam. 8/x. 



Lismore (263). 



The nearest published species to this form would seem to be 

 C. ohtusa Dill, which is described by Chodat (Alg. vertes, p. 13S) 



as "Cellules ellipsoides chromatophore en cloche allongee 



dimensions 25-30/x." I have not seen Dill's type-figure, 



but France (Algengatt. Cm-teria T. iii., f. 16-18) gives figures of 

 typical specimens, which do not at all agree with our form, either 

 in outline or in the arrangement of the cell-contents. The cyto- 

 plasm is finely granular, without any distinct arrangement, pyre- 

 noid absent. The nucleus occupies the centre of the cell, sur- 

 rounded by a hollow sphere of darker-coloured chlorophyll. 

 From all sides, the appearance is the same. 

 Yar. ovata, n.var. (PL Ivi., f. 10). 



Cellulse ovatse, fronte obtusse, postice late-rotundatse; ceteris ut 

 in f. typica. Cell. long. 24, lat. ISyu. Lismore (263). 



Compare Carteria Fritschii Takeda, Ann. Bot. xxx., 1916, p. 370. 



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