106 AUSTRALIAN FRESUWATER rLAGELLATES, 



Genus H E X A ii i t a Dujardin. 

 Hexamita ixflata Dhj. (PL i., fig. 13). 



Dujardin, p. 296; Stein, T. iii., Aht. iv., f. 1—6. 



Lismore (344). With tlio preceiiing species. 



Dujardin gives the length as 17 — 20^. What I figure is probably a young 

 form, as the whole front half of the body was homogeneous and transparent, nor 

 did 1 observe the four anterior Hagella which might, however, have Ijeen present. 

 The shape was almost quadrangular, rounded and bag-shaped in front, truneate- 

 emarginate behind with distinct angles furnislied each with a long flagellum. 



Chrysomonadineae. 



Fara. CHKOMULINACEAE. 



Genus C h b O m r t> i x a Cienkowski. 



Chromulina flavican-.s (Ehr.) (Text-fig. 2 a — d). 



Coenob. diam. 20 — 60; cell. diam. 8 — 12^. 



Centennial Park, Sydney. 



Syn. Moiias j'lavicam Ehr.; Chrysomonas fhicicaiis (Ebr.) Stein, op. cit. 

 T. xiii., f. 16 — 19. Very rare, only once observed. Our forms ag^i'ee perfectly 

 in size and appearance with Stein's excellent figures in Naturg. d. Flagellaten. 

 The dimensions of his figures work out at : coenob. diam. 15 — 65, cell, diara. 

 7 — 10^. The chromatophores are yellow-green, an-anged as in Synura and 

 Mallomonas. When mature, the cells are globose, but from self-division are 

 generally found more or less oval. 



Chromulina ochracea (E)lir. ) (Test. -fig. Ic). 



Cellulae sphaeri<'ae, diam. oi — 8J/x. Lismore (294). 



Minute spherical cells witli two yellow-green chromatophores longitudinally 

 and rather irregularly disposed within the cell and not ijuite parietal. Tliere is 

 a minute stigma and relatively large c.v. 



Syn. Monas ochracea Ehr.; (Jhrysomonas ochracea (Ehr.) Stein, T. xiv., 

 Abt. iii., f. 1, 2. This and all other forms of Chromulina mentioned here were 

 found enmeshed in the mycelium of a fungus suiTcmiiding a rotting plant stem 

 floating in swamp waters. 



CiiBOMiLiXA ovALis Klcbs. ( Text-fig. 1(/, e). 



Cell. long. 8i— Hi, hit. 51— 7]/^. Lismoie (294). 



Cf. Senn, op. cit., p. 154, f. 107, B2. Oval or oblong in contcmr, with a de- 

 cided nick to one side in front from which the flagellum springs. At this [loint 

 there seems to be a kind of protrusile or distensilde pharynx. 1 noted one 

 feeding on cells of Bacterium termo. These were worked down tlu^ llagelluni and 

 received with a globule of water ((u- plasma 1 whicli could he observed as a very 

 distinct swelling pa.ssing down tlie side of the cell till it lodged in the ])osterior 

 part of the cell. Exactly the sanu' ])roceduie is depicted by Senn, p. IT), in the 

 case of Oicomonas termo Ehr. which this species of Chromulina vei'v much re- 

 sembles. Is it possible that one is a saprophytic form of the other? 



