296 PROTOZOOLOGY 



cal; almost always twisted, somewhat flattened; anterior end round- 

 ed, posterior end pointed; pellicle with spiral striae; numerous dis- 

 coid chromatophores; two ovoid paramylon bodies, 20-40/* long, one 

 on either side of nucleus, and also small bodies; stigma large; flagel- 

 lum short; sluggish. 



E. sanguinea E. (Fig. 118,/). 80-170/* by 25-45/*; posterior end 

 bluntly rounded; flagellum about the body length; pellicle striated; 

 elongate chromatophores lie parallel to the striae; haematochrome 

 granules scattered in sun light and collected in the central area in 

 darkness. 



E. deses E. (Fig. 118, g). 85-170/* by 10-20/*; elongate; highly 

 plastic; faint striae; stigma distinct; nucleus central; chromato- 

 phores discoid with pyrenoid; several small rod-shaped paramylon 

 scattered; flagellum less than \ the body length. 



E. gracilis Klebs (Fig. 118, h). 35-55/* by 6-25/*; cylindrical to 

 elongate oval; highly plastic; flagellum about the body length; fusi- 

 form chromatophores 10-20; nucleus central; pyrenoids. 



E. tripteris Dujardin (Fig. 118, i). 70-120/* by 12-16/*; elongate; 

 three-ridged, rounded anteriorly and drawn out posteriorly; pellicle 

 longitudinally striated; only slightly plastic; stigma prominent; dis- 

 coid chromatophores numerous; two paramylon bodies, rod-shaped 

 and one on either side of the nucleus; flagellum about f the body 

 length. 



E. ehrenbergi Klebs (Fig. 118, j). 170-400/* by 15-40/*; cylindrical 

 and flattened, posterior end rounded; plastic, often twisted; spiral 

 striation; numerous small discoid chromatophores; stigma conspicu- 

 ous; 2 paramylon bodies elongate, up to over 100m long; flagellum 

 about \ the body length or less. 



E. terricola Dangeard (Fig. 118, k). 65-95/* by 8-18/*; pellicle thin 

 and highly plastic; nucleus central; chromatophores long (20-30/*) 

 rods; paramylon bodies small and annular; flagellum about § the 

 body length. 



E. sociabilis D. (Fig. 118, 1). 65-112/* by 15-30/*; cylindrical; deli- 

 cate pellicle; highly plastic; numerous elongate chromatophores; 

 paramylon bodies discoid; flagellum slightly longer than body. 



E. klebsi Mainx (Fig. 118, m). 45-85/* by 5-10/*; form highly 

 plastic; chromatophores discoid; paramylon bodies rod-shaped, up 

 to several; flagellum short. 



E. rubra Hardy (Fig. 118, n). 70-170/* by 25-36/*; cylindrical; 

 rounded anteriorly and drawn out posteriorly; spiral striation; nu- 

 cleus posterior; flagellum longer than body; stigma about 7/* in di- 

 ameter; many fusiform chromatophores aligned with the body striae; 



