TESTACEA 



475 



uoles; pseudopodia long, anastomosing; 60-1 60m long; among algae 

 in fresh and salt water. 



Genus Diplophrys Barker. Test thin, spherical; 2 apertures, one 

 at each pole; cytoplasm colorless; a single nucleus; several contrac- 

 tile vacuoles; filo podia radiating. One species. 



D. archeri B. (Fig. 200, b). With 1-3 colored oil droplets; pseu- 

 dopodia highly attenuate, radiating, straight or branched; multi- 

 plication into 2 or 4 daughter individuals; solitary or in groups; 

 diameter 8-20/z; on submerged plants in fresh water. 



Fig. 200. a, Lieberkuhnia ivagneri, X160 (Verworn); b, Diplophrys 

 archeri, X930 (Hertwig and Lesser); c, Lecythium hyalinum, X330 

 (Cash and Wailes); d, Myxotheca arenilega, X70 (Schaudinn); e, Dac- 

 tylosaccus vermiformis, Xl5 (Rhumbler); f, Boderia turneri (Wright). 



Genus Lecythium Hertwig and Lesser. Test thin, flexible, color- 

 less; aperture elastic, terminal; colorless cytoplasm fills the test; 

 large nucleus posterior; numerous filopodia long, branching, not 

 anastomosing; fresh water. 



L. hyalinum (Ehrenberg) (Fig. 200, c). Spheroidal; aperture cir- 

 cular with a short flexible neck; a single contractile vacuole; diame- 

 ter 20-45/z ; in submerged vegetation. 



