220 Hardy, A Red Euglena. V^uJlh' 



extremity, which is hyahne or rarely green, but with no chloro- 

 phyll corpuscles ; turning to [post mortem) dull red. Red particles 

 (fig. 3) due to intracellular origin, and not ingested. 



Grains (paramylon ?). — Almost filling cell. Not affected by 

 iodine, iodine followed by sulphuric acid, nor chlor-zinc-iodine 

 which stained protoplasm and nucleus brown ; oblong, hyaline, 

 maximum size 6 fx. x 4.5 f.i. (fig. 4). 



Encystment. — In a reticulated stratum with compartments 

 approximating to hexagons (fig. 5). 



Locality. — Doncaster, Victoria, 1904-7. 



Habitat. — A small pool. 



Literature Consulted. 



Bower — Recent Researches into the Origin and Morphology of 

 Chlorophyll Corpuscles and Allied Bodies. Quart. Journ. 

 Micr. Soc, 1884. 



Cambridge Natural History : Protozoa. 



Dallenger — Carpenter's " Microscope and its Revelations." 



Davis — Natural History of Animals. 



Ehrenberg — Die Infusiosthierchen (1838). 



GoEBEL — Organography of Plants (Balfour, trans.) 



Kerner von Marilaun — Natural History of Plants (Oliver, 

 trans., 1894). 



Macdougal — Practical Text-book of Plant Physiology (1901). 



Pfeffer — Physiology of Plants (Ewart, A. J., trans,, 1900). 



Parker — Lessons in Elementary Biology (1891). 



Parker and Haswell — Text-book of Zoology (1897). 



Pritchard — History of the Infusoria (1861). 



Saville Kent — Manual of the Infusoria. 



Sallitt, J. A. — On the Chlorophyll Corpuscles of Some In- 

 fusoria. Quart. Journ. Micr. Soc, 1884. 



Strasburger — Text-book of Botany. 



Sachs — Lectures on the Physiology of Plants (Ward, trans.) 



Wagers — On the Eye-Spot and Flagellum of Euglena viridis. 

 Journ. Linn. Soc, 1900. 



Warming — Ecology of Plants (1909 ; Groome and Balfour, 

 trans.) 



Explanation of Plate XVIII. 



Y\g. I. — E. rubra, motile and encysted ; and 2, E. viridis, to same scale. 

 (Cameral lucida drawing.) X450+. 



Fi£T. 3, — Posterior end E. rubra, showing globules and red particles observed 

 in living cells, 1905 ; c.l. x about 1,000. 



Fig. 4. — Showing encysted E. rubra with inter-granular red oil. First noticed 

 after being mounted some months in formalin. 



Fig. 5. — Encystment stratum, {a) A resting Euglena, {b) septum, {c) bedding. 

 (The empty compartments have been vacated by cells which have resumed 

 motility.) 



Fig. 6. — Nodulated flagellum, with three nodules — one at extremity; occasionally 

 seen. 



