BY G. I. PLAYFAIR. 103 



what doubtful — it might be a foiiu of Poteriodendron. Out of weeds in a creek 

 pool, along with Dinohri/<iu and Poteriodendron. 



Fam. PHALANSTERIACEAE. 



Genus P H A L A N s T E R I r m; Cienkowski. 



Phalan.sterium ooxsociatum (Fres.) Cienk. (Text-fig. la). 



Coenob diam. 100—440^. 



Auburn (140, 149); Rookwood ; Lismoie (308). 



Cienkowski, Beitr. z. Kenntn. mikiosk. organisuien ; Kent, Infusoria, PI. 

 xii., f. 5 — 9; Stein, I.e., T. vii., fig. 1, 2. Generally met with in ground gather- 

 ings in swampy places. It occurs as irregularly circular or oval cushions with 

 scalloped edges, consisting of a pale yelhjw or brownish mucus, minutely granu- 

 lar. In optical section at the edges the cushion shows as composed of a series 

 of radiating wedges, eacii containing two cells near the margin. From above, the 

 structure is irregularly polygonal. 



Fam. MONADACEAE. 



Geims D f: N D R M N A .s Stein. 



Dendromonas virgaria Stein. (Text-fig. 2e). 



Naturg. d. Flagell., H. i.. T. vi., fig. 1 — 5. Very rare, noted only once, from 

 the Richmond River at Lismore (18fi) as a spray of a large number of living 

 cells, the latter 10 x S^i. agreeing in shape with those figured by Stein. Differs 

 from Avthophysa in having a delicate branched coenobium, each cell being fixed 

 at the end of a separate branch; cf. Senn. I.e., p. 133. 



Genus A n t n o p H y s a Bory. 

 ANTHOPHY.SA vEGETAN.s (O. F. Muller) Stein. 



Coenol diam. 24 — 28; cell. long. 12, lat. 4 — 6^. 



Auburn; Parramatta; Lismore (253, 260, 263). 



Cf. Stiin, I.e., T. v., fig. 1—17; Senn, I.e., p. 133, fig. 89c. ThLs organism 

 consists of a cluster of euneate cells attached to stones or weeds by a very ir- 

 regular raucous peduncle which gets gradually drawn out thinner and thinner 

 by the movement of the flagellate cells until the cluster breaks away and becomes 

 a free-swimming stellate coenobium. The shape of the cells seems to vary from 

 pyriform to euneate, generally the latter as far as my observation extends". 



Genus C e p h A l o t h a ji n' i r ji Stein. 

 Cephalothamxium cyclopum Stein. (?) (Text-fig. 2/.) 



Long. Corp. 10, lat. 3 ; long. stip. 10 ; long. flag. c. 20^. 



Canley Vale (128). 



A few single zooids noted on the shell of an entomostracan. 



They were hyaline and perhaps represent this species. Of course, each 

 coenobium must begin with a single stipitate or sessile zooid. Cf. Cephalotham- 

 n!um caespitosum Kent and C. cuiteatum Kent; also Antliophi/sa stagnatilis 

 Stokes, p. 83, PI. i., f. 16, 17. 



