118 AUSTRALIAN FRESHWATER FLAGELLATES, 



type is the aerial t'oiin, when the organism ilevclops in surface crusts. Euglena 

 sociabilis living and gi'owing altogether under water has a characteristic method 

 of development and a series of vegetative stages entirely its own. Yet without 

 a doubt it reaches the same objective. 



The vegetative cell is generally involved in a wide :uul often .stratitied globe 

 of clear mucus. 



EOGLENA AMBLYOPHis (Ehr.) mihi. (PI. iii., fig-s. 10, 11). 



Syn. Amhlyophis riridis Ehr. It has generally been considered that there 

 is nothing in this form to .iustify Ehrenberg's g-enns Amhhjophis; at the same 

 time I cannot agiee with those who would make it merely a tail-less form of 

 Euglena viridis. For one thing, the disposition of the cell-contents is ditlereut. 

 Also the latter is a comparatively small species (the type at any rate), whereas 

 Euglena amhlyophis is (^ne of the very largest forms. It is strap-shaped, rounded 

 behind and attenuated in front, membrane smooth, finely and spirally striate, 

 body very transparent, no paramylon granules or rods (in this respect also very 

 different from E. i-iridia), no tiagelluni. Specimens from three localities fairly- 

 wide apart are all in agreement. 



Long. 2(l(t— 300, lat. 20— 25/x. 



P.iitiinii- (iardens, Sydney (137); Kyogle (216); Lismore (286). 



Euglena desks Elu-enberg. (PI. iii., figs. 12 — 14). 



This species is narrowly strap-shaped and very plastic, slightly attenuate in 

 front and usually coming abruptly to a sharp point behind, but sometimes very 

 gradually narrowed to a subacute tip; no tail and only a very weak flagellum or 

 none at all. Membrane smooth, striae not noted. In most Eutjlenue the striae are 

 very delicate and need the l-12th inch homog. immersion lens for their detec- 

 tion. The same is true of the chloroplasts except in certain species of which 

 this is one. Here, on the other hand, they are nearly always very distinct, especially 

 at the sides where they show as little lenticular cushions, and are characteristic 

 of the species. No paramylon granules or rods as a rule. 



Long. 100—180, lat. io— ISjit. 



Coraki; Wyrallah; Lismore (237, 2.54, 258. 293, 295, 347). 



In a nnicous stratum of Spirulina major gathered on the river-bank at 

 Coraki, there were numbers of E. deses developing out of the vegetative cell, 

 from which (PI. iii., fig. 14) it was evident that they are formed by direct growth 

 out of the original cell itself. 



Var. MINUTA, n.vai'. (LI. iii., tig. 15). 



Dimensionibns <|uam in forma fyi>ica diniiilio luintirilius; hmg. 70, lat. 6yu. 

 Lismore. 



Var. GRACILIS^ n.var. 



Forma gracilior, chloroplastidibus hand distinctis; long. 120. lat. S^. 

 Casino. 



It seems probable that E. dieses is the base foi-ni trom whidi both Kuglena 

 -pircjyyra and E. acM.s are developed. Along with this narrow form was anotlier of 

 similar size and shape, but exhil)iting the granulate striae of E. spiropi/ra and 

 at the same time the acutely pointed tail of E. acM.s. Upon another occasion I 

 noted a form with the shape and conspicuous chloroplasts of E. dieses, but \rith 

 the series of paramylon rods characteristic of E. acus, and with a tail end 

 evidently a compromise between the two species. Cf. Dangeard, op. eit., p. 93. 



