264 



PROTOZOOLOGY 



cies; holozoic or saprozoic; the majority are free-living, though a few 

 parasitic. 



Genus Mastigamoeba Schulze {Mastigina Frenzel). Monomasti- 

 gote, uninucleate, with finger-like pseudopodia; flagellum long and 

 connected with nucleus; fresh water, soil or endocommensal. 



Fig. 113. a, MuUicilia marina, X400 (Cienkowski) ; b, M. lacustris, 

 X400 (Lauterborn) ; c, Mastigamoeba aspera, X200 (Schulze); d, M, 

 longifilum, X340 (Stokes); e, M. setosa, X370 (Goldschmidt); f, Masti- 

 gellavitrea, X 370 (Goldschmidt). 



M. aspera S. (Fig. 113, c). Subspherical or oval; during locomotion 

 elongate and narrowed anteriorly, while posterior end rounded or 

 lobed; numerous pseudopods slender, straight; nucleus near flagel- 

 late end; 2 contractile vacuoles; 150-200^ by about 50/x; in ooze of 

 pond. 



M. longifilum Stokes (Fig. 113, d). Elongate, transparent; flagel- 

 lum twice body length; pseudopods few, short; contractile vacuole 

 anterior; body 28/i long when extended, contracted about 10/x; stag- 

 nant water. 



