PROTOMONADINA 285 



Parasitic in reproductive organs of molluscs and other invertebrates 

 and in blood and gut of fish. 



C. helicis L. (Fig. 128, a). In reproductive organs of various species 

 of Helix in America and Europe; Q-20fx long; asexual reproduction 

 through binary fission. 



C. horreli (Laveran and Mesnil) (Fig. 128, b). In blood of various 

 freshwater fishes such as Catostomus, Cyprinus, etc.; 20-25^ long. 



C. cyprini (Plehn) (Fig. 128, c). In blood of carp and goldfish; 

 10-30julong; rare. 



C. grohheni (Keysselitz). In coelenteric cavity of Siphonophora; 

 about 65m by 4^. 



Fig. 128. a, Cryptobia helicis, X1690 (Belaf); b, C. borreli, X580 (Mavor); 

 C. cyprini, X600 (Plehn). 



Family 7 Amphimonadidae Kent 



Body naked or with a gelatinous envelope; 2 equally long anterior 

 flagella; often colonial; 1-2 contractile vacuoles; free-swimming or 

 attached ; mainly fresh water. 



Genus Amphimonas Dujardin. Small oval or rounded amoeboid; 

 flagella at anterior end; free-swimming or attached by an elongated 

 stalk-like posterior process; fresh or salt water. 



A. globosa Kent (Fig. 129, a). Spherical; about IS/z in diameter; 

 stalk long, delicate; fresh water. 



Genus Spongomonas Stein. Individuals in granulated ^gelatinous 

 masses; flagella with 2 basal granules; one contractile vacuole; colo- 

 nial; with pointed pseudopodia in motile stage; fresh water. 



S. uvella S. (Fig. 129, b). Oval; 8-12/i long; flagella 2-3 times as 

 long; colony about 50/i high; fresh water. 



