146 



OOCYSTIS AND KREMOSPHiERA, 



Var, NODOSA, n.var. (PI. ix., f.ll, 12). 

 Cellulse sphfericae, membrana utroque polointrorsum incrassata. 

 Cell. diam. 40, 42, 50, 52, 56; membr. crass. 2-3/x. 

 Potts Hill (138); Auburn (140, 148, 149); Lismore (240). 



Var. Chodati, noin.nov. (Text-fig. 28). 

 Cellulse late-ellipticai, ovales; lateribus arcuatis; apicibus late- 

 rotundatis, utroque polo interdum introrsuni 

 incrassatis. Chloroplastides in laminis radian- 

 tibus ordinatae. 



Gf. Chodat, Bot. Zeit., 1895, T. v., f.lO; no 

 dimensions given, nor magnification. I have 

 not met with this form, which is somewhat 

 like var. ovalis but more elliptic, not so sub- 

 globose. The chloroplasts also are diffei'ent, 

 E. virklis var. Cho- ^^^"S small, radiating laminae, instead of the 

 dati mihi; after usual parietal discs. The large, central body 

 Chodat. indicates that it is a form of EremospJuera. 



EXPLANATION OF PLATES VII. -IX. 



Plate vii. 



Figs. 1-4. — Oocystis NiigeVii A.Br., three form.s of the type; (1-3), x 1000; 



(4), X 1330. 

 Figs. 5. 6. ,, ,, mother-cells; (5), X r)00; (6), X 665. 



Fig.7. ,, ., var. obesa, n.var.,{ x 1330). 



Fig. 8. ,, ,, var. c?t»Va, n.var., ( X 1.3.30). 



Figs.9, 10.— 0. Xovct Semi ice Wille; (9), mother-cell, ( x 665); (10), one of 



the autospores,( x 1330). 

 Figs. 11, 12. „ „ f. majw Wille; (11), mother-cell,(x500); (12), 



an autospore,( x 1330). 

 Figs. 13-17. ,, ,, var. australica, n.var., (13-15), from Parra- 



matta; (13, 14), x 665; (15), x 1000; (16, 17), 



from Lismore, ( x 1330). 

 Figs. 18, 19. — 0. vrassayar. Osten/e/dii, nom.nov., (18), mother-cell,( x 665); 



(19), one of the autospores,( x 1000). 

 Fig.20. — O. laniMri^ Chodat, with two generations of aiitospores, ( x 1000). 

 Fig.21. ,, var. natans (Lemm.) mihi,( x 1000). 



Figs. 22, 23. ,, var. paludensis, n.var. ; (22), mother-cell, ( x 330); (23), 



one of the autospores,( x 1330). 

 Fig. 24. ,, the same, with diiferent chloroplasts, ( x 1000). 



Figs.25, 26.— O. parva W. & G. S. West,( x 1000). 



