PROTOMONADINA 289 



what similar to Cephalothamnium; stalks yellow or brownish and 

 usually bent; detached individuals amoeboid with pointed pseudo- 

 podia. 



A. vegetans (Miiller) (Fig. 130, y, k). About 5-6^ long; common in 

 stagnant water and infusion. 



Family 9 Bodonidae Biitschli 



With 2 flagella; one directed anteriorly and the other posteriorly 

 and trailing; flagella originate in anterior end which is drawn out 

 to a varying degree; one to several contractile vacuoles; asexual re- 

 production by binary fission; holozoic or sap ro zoic (parasitic). 



Genus Bodo Ehrenberg (Prowazekia Hartman and Chagas). 

 Small, ovoid, but plastic; cytostome anterior; nucleus central or 

 anterior; flagella connected with 2 blepharoplasts in some species; 

 encystment common; in stagnant water and coprozoic. Numerous 

 species. 



B. caudatus (Dujardin) (Fig. 131, a, h). Highly flattened, usually 

 tapering posteriorly; 11-22^ by 5-10/x; anterior flagellum about 

 body length, trailing flagellum longer; blepharoplast; cysts spherical; 

 stagnant water. 



B. edax Klebs (Fig. 131, c). Oval with pointed anterior end; 11-15/x 

 by 5-7/i; stagnant water. 



Genus Pleuromonas Perty. Naked, somewhat amoeboid; usually 

 attached with trailing flagellum; active cytoplasmic movement; 

 fresh water. 



P. jaculans P. (Fig. 131, d). Body 6-10/i by about 5^; flagellum 

 2-3 times body length; 4-8 young individuals are said to emerge 

 from a spherical cyst; stagnant water. 



Genus Rhynchomonas Klebs {Cruzella Faria, da Cunha and 

 Pinto). Similar to Bodo, but there is an anterior extension of body, 

 in which one of the flagella is embedded, while the other flagellum 

 trails; a single nucleus; minute forms; fresh or salt water; also some- 

 times coprozoic. 



R. nasuta (Stokes) (Fig. 131, e). Oval, flattened; 5-6m by 2-3/x; 

 fresh water and coprozoic. 



R. marina (F., C. and P.). In salt water. 



Genus Proteromonas Kunstler (Prowazekella Alexeieff). Elon- 

 gated pyriform; 2 flagella from anterior end, one directed anteriorly 

 and the other, posteriorly; nucleus anterior; encysted stage is re- 

 markable in that it is capable of increasing in size to a marked de- 

 gree; exclusively parasitic; in gut of various species of lizards. 



P. lacertQ,Q (Grassi) (Figs. 9, 6; 131, /). Elongate, pyriform; 10- 



