100 AUSTRALIAN FRESHWATER FLAGELU4TES, 



Given a Miitable district tlie most advantageous eoui-se to pursue is lo 

 thorouglily exploit its treasure.s over a term of years, by repeated gatherings 

 from every little jjoud, roadside puddle, or piece of swampy ground. ^Ul the 

 forms marked "Lismore" in this paper were gathered within a circle no more 

 than 2 miles in diameter, and yet after my having thoroughly ransacked this 

 comparatively small area for eight years, two fine specimens, never preWously 

 recorded — Mallomoiuis Vitomesa Stokes and Traciielomatias splejiilida, n.sp. — - 

 make their appearance from pools already well searched (March, 1920). Com- 

 pare my remarks in "New and rare freshwater Algae" (These Proceedings, xliii., 

 1918, p. 498). Trachelotiwna.s splendida was obtained from the pool there 

 referred to. 



Mention is here made of 172 forms of flagellate life representing 39 genera; 

 105 being classed a.s species, 62 as varieties and 5 forms. Of these, 43 species, 

 48 varieties and .5 forms (95 in all) are considered to be hitherto undescribed. 

 One genus, Scintilla, is proposed as new. 



These figures, however, do not include the 104 forms of Trachelomvnas 

 previously recorded. When these are added, the total number of non-Volvocine 

 Flagellates observed to date, stands at 276. The proportion of new forms may 

 appear rather large, but it should be borne in mind that hardly any work has 

 been done on the freshwater Flagellates of subtropical or tropical countries, and 

 that it is exactly tlie higher temperatures prevailing there and the greater vicis- 

 situdes to which pond life is subjected, that are the cause of the much larger 

 number of varieties to be observed. 



The enlargement attached to the figures in the explanation of the plates is 

 not the magnification used in obseiTation of the living specimens but merely 

 indicates the scale (somewhat reduced) used in drawing tlie figures for repro- 

 duction. Observations were made chiefly with a 1/6 inch hol'.scopic objective, 

 N.A. .95, and 18 diam. ocular in a tube-length of (i inches. Thcs ■ were assisted 



by a l/12in. homogeneous holoscopic lens. 



t 



FLAGELLATAE <^ 



Protomastigineae. 

 Fam. BICOECACEAE. 

 Genus P o t i: r i o d k x d r o n 'Stei)i. 



POTERIODENDRON l'l:TIOL.\Tri[ Stein (PI. i., tig. 1). 



I.orica long. 17—22, lat. 8--ll;u. 



(Juildford (77); Lismore (260, 290, 298). 



Stein, Dei- Organismus der Infusionsthiere, iii., H.i., T.xi.. tig. 8 — 11; Senn, 

 Flagellata, p. 123, f. 80; Kent, Infusoria, Stijlobrijon petiolatnm (non Dujardin), 

 PI. xxiii., fig. 17 — 30; Dinobrijon petiolatnm Lennu., (Jattung Diiiobri^oii, )). 

 519. 



The cu|iule lia.s a slightly everted rim. I liavc never seen tlie zooid. Inil 

 small sprays (jf (he empty cupules occur very sparsely in my gatherings. They 

 are generally faintly rufescent, differing in tiiis from all forms of Dinobri/on, the 

 petioles inconspicuous and no longer than the (nipules, so that tlie latter appear 

 to be sessile. They may always be distinguished from Dinobri/on by a minute 

 refringent blob at the base, maiking the head of the petiole which is there 

 slightly dilated. Main ))etiole of a spray noted — 55^ long. For Stylobrijon 

 Fromenfal (see Kent, I.e., PI. xxiii., fig. 29) the arrangement of the cupules in 



