114 



OOCTSTIS AND EREMOSPH^RA, 



Cwtnection with Oocyst is. — In Eremosjyhffra, as in Oocystis, the 

 cell generally becomes greatly distended in the production of 

 autospores; sometimes, however, this inflation does not, or can- 

 not, take place. Under these circumstances (and perhaps under 

 ordinary conditions also) especially in small cells, J^7-emosphrpra 

 will give rise to Ooc^s^is-autospores. Chodat, Lc, has already 

 figured such cases,* (see fig. 196, under 0. rotula), and, in Text- 

 fig. 3, I reproduce two that have come under my own notice. In 



Text-fig. 3. — Eremospluvra mother-cells with Ooi-yf!ti» autospoies; 

 (a)(_)ocy.-<tix anxtralitmi-f mihi( x 665); {b) 0. Chodat I mihi ( x 500). 



Text-fig. 36, the autospores are 0. Chodati mihi; in Text-fig. 3«, 0. 

 australiensis mihi. The spherical mother-cells were easily recog- 

 nisable as Eremosphoira by the thick mucous lining of the cell- 

 wall, and, in the case of fig.3«, vegetative cells of Eremosphcera 

 viridis of the same diameter (46 /x) were present in quantity; the 

 autospores are types of Oocystis commonly found here as free 

 vegetative cells. Fui-ther, 0. oval is sometimes produces Erenw- 

 sphfPJ^a-autospoves, cf. PI. vii., f.20, size of specimen, long. 67, lat. 

 40/x. 



All my observations, then, tend to show that Eremos2)h(era 

 viridis is an Oocystis, and should be included in that genus; the 

 constitution of the cell is the .same, the chloroplasts are the same, 

 its polymorphic forms exhibit just as marked polarity as any 

 species of Oocystis; and, upon occasions, it gives rise to Oocystis- 



* In T. v., f.9, the autospores are O. Chodati mihi, but with radiating 

 chloroplasts; in figs. 19, 21, the lower mother-cell is 0. rotula mihi; the 

 autospores of the upper are suspiciously like O. Nagelii (elliptica). 



