344 PROTOZOOLOGY 



anterior; one flagellum; contractile vacuole anterior; rare. 



T. compressa S. (Fig. 140, c). 22/u by 18/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. 140, d). Triangular, flattened; posterior 

 end pointed; 6-7/z by 5-6/n; flagellum short; a contractile vacuole; 

 standing fresh water. 



Genus Platytheca Stein. With a flattened pyriform lorica, with a 

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



P. microspora S. (Fig. 140, e). Lorica yellowish brown, with a 

 small aperture; 12-18/x long; flagellum short; among roots of Lemna. 



Genus Aulomonas Lackey. Solitary and colorless; enclosed in, but 

 not attached to, a thin hyaline cylindrical tube, which expands like a 

 funnel at one end and broken at the other end; fresh water. 



A. purdyi L. (Fig. 140,/). Ovoid, 6-8ju by 4-5/x; flagellum 10-16m 

 long; nucleus median; one contractile vacuole at each end of the 

 body (Lackey, 1942). 



Genus Caviomonas Nie. Elongate pyriform; a single flagellum 

 from the rounded anterior end where a vesicular nucleus is located; 

 a band-like "peristyle" runs along the body; without cytostome; 

 parasitic. One species (Nie, 1949). 



C. mobilis N. (Fig. 140, g). Body 2.2-6.6/x by 2-3m; average 4/x by 

 3ju; in addition to the peristyle, a short, fine spinous strand occurs; 

 in the caecal contents of guinea-pig, Cavia porcella. 



Family 5 Trypanosomatidae Doflein 



Body characteristically leaf-like, though changeable to a certain 

 extent; a single nucleus and a blepharoplast from which a flagellum 

 arises (Figs. 9; 141); basal portion of the flagellum forms the 

 outer margin of undulating membrane which extends along one side 

 of body; exclusively parasitic; a number of important parasitic 

 Protozoa which are responsible for serious diseases of man and 

 domestic animals in various parts of the world are included in it. 

 Morphology and taxonomy (Grass6, 1952). 



Genus Trypanosoma Gruby. Parasitic in the circulatory system of 

 vertebrates; highly flattened, pointed at flagellate end, and bluntly 

 rounded, or pointed, at other; polymorphism due to differences in 

 development common; nucleus central; near aflagellate end, there is 

 a blepharoplast from which the flagellum arises and runs toward 



