B¥ G. I. PLAYi'AlR. 109 



Mallomonas adstralicAj n.sp. (PI. ii., %. 5). 



Cellulae elliptieo-eylindraceae ; mediis lateribus I'ere rectis; apic-ibus late- 

 rotundatis. Membrana hyalina im-iassata, giauulis parvis in seriebus trans- 

 versi.s ordiuati.s urnata; setis uullis notatis. 



Cell. long. 20—25, lat. 10;x. 



Botanic Gai-dens, Sydney (3); Botany; Guildford; Lismoie (245). 



A much rarer species than either of the foregoing. When mature it is 

 obloiig-eylindrical with broadly rounded ends, and crossed transversely but not 

 oblicjucly by rows of small gi'anules. No setae observed. 



Var. GRACILLIMA, n.var. (PL ii., tig. 6). 



Forma gTaciUmia, magis stride cylindracea; lateribus fere rectis, apieibus 

 rotundatis. Membrana ut in forma typica; setis nullis. 

 Cell. long. 22, lat. 4^. Lismore. 



Var. SUBGLOBOSA, H.var. (PI. ii., figs. 7, 8). 



Cellulae subglobosae vel ovales, plerumijue fronte paullo augnstatae; vesicu- 

 lis contractilibus 4 juxta extremitatem posteriorem; ceteris ut iu forma typica. 



Cell. long. 21—27, lat. 16ju. Lismore (316), from swampy ground. 



These are probably young growth forms of the type, either still in pro- 

 cess of development or, a-s I think more likely, which have become fixed by the 

 hardening of the cell-wall due to stagnation. On either view they give us a 

 glimpse of the life-history of the organism. 



ilALLOilOXAS LITOMESA Stokcs. (PI. ii., fig. 9). 



Cell. long. c. 25, lat. c. 5p Lismore. 



Stokes, Fre.shwater Infusoria of the U.S., .Journal Trenton Nat. Hist. Soc, 

 i., 1888, p. 92, PI. i., f. 32. 



Very rare indeed, only once observed. The body is linear-elliptic, mem- 

 brane delicate and smooth (Stokes says however "Cuticular surface finely crenu- 

 late"), a few straight setae at the hinder end, but those in front are charac- 

 teristic, being six in number springing from a small membraneous projection 

 and curved back like the ribs of an umbrella. Chromatophores pale yellow- 

 gi-een, close to the cell-wall. 



Var. CURTA, n.var. (PI. ii., fig. 10). 



Cellulae eui-tae. oblongae; pone late rotundatae sine setis; ceteris ut in foi-ma 

 typica. 



Lismore, with the type. 



This form is very short, oblong, broadly rounded l)eliind where the setae 

 are wanting; otherwise like the type. Size not noted. A narrower and more 

 strictly cylindrical form, much less commonly met with. Sometimes at the an- 

 terior end there is a sliglit membraneous bi-papillate pro.i'eetion, and below the 

 flagellum, just between the ends of the chromatophores, a dark granule may oc- 

 casionally be distinguislied. I have noticed the same in Synura granulosa, cf. 

 New and rare freshwater Algae, p. 508, PI. Ivi., f. 1 — 3. 



