PROTOMONADINA 



243 



flagellum 1.5 times as long as body; contractile vacuole posterior; 

 standing fresh water. 



Genus Lagenoeca Kent. Resembles somewhat Salpingoeca; 

 with lorica; but without any pedicle between body and lorica; 

 solitary; free-swimming; fresh water. 



L. ovata Lemmermann (Fig. 110, g). Lorica oval, IS/z long; body 

 loosely filling lorica; flagellum 1.5 times body length; fresh water. 



Family 4 Oikomonadidae Hartog 



Genus Oikomonas Kent. A rounded monomastigote; uninu- 

 cleate; encystment common; stagnant water, soil and exposed 

 faecal matter. 



Fig. 111. a, Oikomonas termo, X1330 (Lemmermann); b, Thylaco- 

 monas compressa, X640 (Lemmermann); c, Ancijromonas contorta, 

 X2000 (Lemmermann); d, Platytheca microspora, X650 (Stein). 



0. termo (Ehrenberg) (Fig. Ill, a). Spherical or oval; anterior 

 end hp-like; flagellum about twice body length; a contractile 

 vacuole; 5-9/i in diameter; stagnant water. 



Genus Thylacomonas Schewiakoff. Pellicle distinct; cytostome 

 anterior; one flagellum; contractile vacuole anterior; rare. 



T. compressa S. (Fig. Ill, fe). 22^t by IS/x; flagellum body length; 

 fresh water. 



Genus Ancyromonas Kent. Ovate to triangular; free-swimming 

 or adherent ; flagellum trailing, adhesive or anchorate at its distal 

 end, vibratile throughout remainder of its length; nucleus central; 

 a contractile vacuole; fresh or salt water. 



A. contorta (Klebs) (Fig. Ill, c). Triangular, flattened, poste- 

 rior end pointed; 6-7/x by 5-6^; flagellum short; a contractile vac- 

 uole ; standing fresh water. 



Genus Platytheca Stein. With a flattened pyriform lorica, with 

 a small aperture; 1 or more contractile vacuoles; fresh water. 



