206 PROTOZOOLOGY 



always spirally twisted, somewhat flattened; pellicle with spirally 

 arranged striae; numerous chromatophores; without pyrenoids; 

 2 ovoid paramylon bodies conspicuously observable, one on 

 either side of nucleus; flagellum short. 



E. sanguinea E. (Figs. 37, e-h; 95, /). 55-120^ by 28-33^; 

 with haematochrome; often found in crust on surface or half-dry 

 bed of a pool; considered by some workers as a variety of E. 

 viridis. 



E. deses E. (Figs. 24, a; 95, g). 85-155m by 15-22^; elongate, 

 highly plastic; body striation faintly visible; stigma distinct; 

 nucleus central, numerous chromatophores hemi-lenticular; 

 several small rod-shaped paramylon bodies scattered; flagellum 

 short. 



E. gracilis Klebs (Figs. 37, a-d; 95, h). 37-45/x by 6-23m; 

 cylindrical to elongated oval; highly plastic; flagellum less than 

 body length; chromatophores numerous, discoid; nucleus central; 

 pyrenoids. 



Genus Khawkinea Jahn et McKibben. Similar to Genus 

 Euglena, but without chromatophores and thus permanently 

 colorless; fresh water. 



K. halli J. et Mc. 40-45^ (30-65^) by 12-14^; fusiform; pellicle 

 spirally striated; plastic; flagellum slightly longer than body; 

 stigma 2-3/i in diameter, yellow-orange to reddish-orange, com- 

 posed of numerous granules; numerous (25-100) paramylon 

 bodies elliptical or polyhedral; cysts 20-30ju in diameter; putrid 

 leaf infusion; saprozoic. 



K. ocellata (Khawkine). Similar to above; flagellum 1.5-2 

 times body length; fresh water. 



Genus Phacus Nitzsch. Highly flattened; asymmetrical; body- 

 form constant; pellicle often with prominent longitudinal or 

 oblique striae; a flagellum and a stigma; nucleus posterior; a 

 short "cytopharynx"; green chromatophores rounded discoid; 

 with or without paramylon bodies around a pyrenoid; in fresh 

 water. Numerous species. 



P. pleuronectes (Miiller) (Fig. 96, a). 4:5-50^i by 30-33/1 ; short 

 posterior prolongation slightly curved ; a prominent fold on con- 

 vex side, extending to middle of body; longitudinally striated; 

 one or more circular paramylon bodies ; colorless forms sometimes 

 appear; flagellum as long as body. 



P. longicaudus (Ehrenberg) (Fig. 96, 6). 85-115/1 by 45-70/t; 



