518 NEW AND RARE FRESHWATER ALGM, 



the endochrome. The chloroplast is broken up into a number of 

 very delicate parietal discs, each connected with the large central 

 pyrenoid by a filament narrowing from without inwards. There 

 are about seven discs visible round the margin in optical section. 

 C£. Chi. stellata Dill, Gatt. Chlamyd., p.l7, T. v., f.31-36; Wille, 

 Alg. Notizen ix.-xiv., p. 134, T. iv., f.4. The latter, however, has 

 a massive chloroplast, and differs considerably in appearance. 

 Chi. rotida also has a papilla or apical protuberance. A Glmo- 

 cystis-stage was noted, eight cells in a mucous sphere; the cells 

 were in every respect the same as the zoospore. I have given 

 this species the name '^rohda," as 1 have my suspicions that 

 Oocystis rotula Playf., is a young Gloeocystis-^tagQ of it. 



Chlamydomonas alpina (Wille) mihi. (PI. Iv., f.l3). 



Chloromonas alpina Wille, Alg. Notizen ix.-xiv., p. 152, T. iii., 

 f.24-34. 



Cell. long. 10 J, lat. 7/x. Lismore. 



Noted both with and without a pyrenoid, the latter situated 

 close to the posterior end of the cell. The chloroplast-discs are 

 about 2-3/x in diameter. Two c.v. observed, and an oval orange- 

 coloured stigma in the middle of the cell (near the apex in the 

 type). In the specimen measured, the Hagella were very long, 

 quite twice the length of the cell, but I did not notice if they 

 were so in every instance. Noted in winter, among fungoid 

 growth on a rotten stick in swamp-water. 



Chlamydomonas caudata Wille. (Pl.lv., f.l4). 



Algologische Notizen ix.-xiv., p. 135, T. iii., f.4-11. The only 

 tailed species of Chlamydomonas; it is impossible to make any 

 mistake in the identification. Yet there was not a trace of n 

 pyrenoid, though the body was very transparent, and the nucleus 

 distinctly visible. Stigma wanting. 



Cell. long. 30, lat. 18; corp. long. 20, lat. 12//. Lismore (344). 



Chlamydomonas maculata, n.sp. (PI. Iv., f. 15-17). 

 Cellulse sphaericie, papilla nulla nee projectione apicali; mem- 

 brana crassa interdum lamellosa ; vacuolis contractilibus 2 ; 

 stigmate distincto, hemisphserico, luteo-fusco, paullo supra medium 



