PROTOMONADINA 

 Family 8 Monadidae Stein 



255 



2 unequal flagella; one primary and the other secondary; motile 

 or attached; 1-2 contractile vacuoles; colony formation frequent; 

 free-living. 



Genus Monas M tiller {Physomonas Kent). Plastic and actively 

 motile ("dancing movement"); often attached to foreign objects; 

 not longer than 20/^; known for a long time, but still very in- 

 completely. Krijgsman (1925) studied the flagellar movements 

 (p. 107). 



M. guttula Ehrenberg (Fig. 119, a). Spherical to ovoid; 14-16m 

 long; free-swimming or attached; longer fiagellum about 1-2 

 times body length; cysts 12/x in diameter; stagnant water. 



M. elongata (Stokes) (Fig. 119, h). Elongate; about 11/x long; 



Fig. 119. a, Mo7ias guttula, X620 (Fisch); b, M. elongata, X670 

 (Stokes); c, M. socialis, X670 (Kent); d, M. vestita, X570 (Stokes); 

 e, Stokesiella dissimilis, X500 (Stokes); f, S. leptostonia, x840 (Stokes); 

 g, Stylohryon abbotti, X480 (Stokes); h, Dendromonas virgaria, a young 

 colony of, X670 (Stein); i, Ce-phalothamniuni cyclopicm, X440 (Stein); 

 j, k, Anthophysa vegetans (j, part of a colonv, X230; k, an individual, 

 X770) (Stein). 



