130 



OOCYSTIS AND EREMOSPHiERA, 



Text-fig. 19. 



(n)0. rotitla mihi. [h) E. riridi.- 



fre.sli- water species, but was first noted in sqmewhat brackish 

 ditches in Sweden. 



OocYSTis ROTULA, noni.n()\ . (PL vii., f.31). 

 Cellulye parvie, ovales, ubique rotundat^e; apicibus late-rotund- 

 atis baud incrassatis. Chloroplastides (sectione opticali a is;e) in 

 laminis niinutis radiantibus 5-6 ordinatai. 



Cell. veg. 14 X 11 /x. 

 Guildford (146). 

 Chodat, Bot. Zeit., 1<S'J5, T. v., 

 f.y, 21, 13 (the two, lower, right- 

 hand examples). A rare form; I 

 have only once observed it. Cho- 

 dat, I.e., fig. 9, shows autospores of 

 this form produced by an unin- 

 fiated mother-cell of Ereniosphcura 

 with 0. rofii/a autospores; viridis, an indication that the 

 after Chodat. various Oocyst is-iormH are merely 



reduction-states of Eremosphm-a. I have figured the same 

 phenomenon in the case of O. Chodati and O. aus/raliensis. 



OocYSTi.s SUBSPH.ERICA, n.sp. (PI. vii., f.32, 33). 



Cellulft? subglobosrt^, ubique rotundata', papilla nulla nee in- 

 crassatione. Chloroplastides imlviniformes vel in laminis 

 radiantibus ordinata'. 



Cell. veg. 14x12, IS x 16, 24 x. 20, 25 x 21, 50 x 46/y-. 



Guildford (146); Parramatta Park (136); Lismore (240). 



A form so broadly oval as to be nearly globose. There is no 

 point or papilla or incrassation, that I can see, to mark the 

 apices. The chloroplasts are of the usual discoid shape, or ha\(' 

 the appearance of small, radiating lamina^. The axial ratio \ aries 

 from about 1-1 to 1-2: 1-0, the cells being generally about one- 

 fifth longer than bnjad. 



OocvsTis APicuL.VTA W. West. (Pl.viii., f.l, 2). 

 "(). in familias e 2-4 cellulis formatis consociatis, oblongis, 

 diametro dujilo longius, subapiculatis et incrassatis ad unum- 

 quemque polum." W. West, I.e. 



