PROTOMONADINA 241 



M. ovata K. (Fig. 109, d). 5-1 5m long; with a short stalk. 



M. robusta Stokes (Fig. 109, e). 13/i long; stalk very long. 



Genus Desmarella Kent. Cells united laterally to one another; 

 fresh water. 



D. moniliformis K. (Fig. 109, /). Cells about 6/u long; cluster 

 composed of 2-12 individuals; standing fresh water. 



D. irregularis Stokes. Cluster of individuals irregularly branch- 

 ing, composed of more than 50 cells; cells 7-1 l/x long; pond water. 



Genus Protospongia Kent. Stalkless individuals embedded ir- 

 regularly in a jelly mass, collars protruding; fresh water. 



P. haeckeli K. (Fig. 109, g). Body oval; 8^ long; flagellum 24- 

 32/i long; 6-60 cells in a colony. 



Genus Sphaeroeca Lauterborn. Somewhat similar to the last 

 genus; but individuals with stalks and radiating; gelatinous mass 

 spheroidal; fresh water. 



S. volvox L. (Fig. 109, h). Cells ovoid, 8-12^ long; stalk about 

 twice as long; flagellum long; contractile vacuole posterior; colony 

 82-200m in diameter; fresh water. 



Genus Diplosiga Frenzel (Codonosigopsis Senn). With 2 collars; 

 without lorica; a contractile vacuole; solitary or clustered (up to 

 4) ; fresh water. 



D. francei Lemmermann (Fig. 109, i). With a short pedicle; 

 12m long; flagellum as long as body. 



D. socialis F. (Fig. 109, j). Body about 15yu long; usually 4 ■ 

 clustered at one end of stalk (15^ long). 



Family 3 Bicosoecidae Poche 



Small monomastigote; with lorica; solitary or colonial, collar 

 may be rudimentary; holozoic; fresh water. 



Genus Bicosoeca James-Clark. With vase-Hke lorica; body 

 small, ovoid with rudimentary collar, a flagellum extending 

 through it ; protoplasmic body anchored to base by a cytoplasmic 

 filament (flagellum?); a nucleus and a contractile vacuole; at- 

 tached or free-swimming. 



B. socialis Lauterborn (Fig. 110, a). Lorica cylindrical, 23m by 

 12m; body about 10m long; often in groups; free-swimming in 

 fresh water. 



Genus Salpingoeca James-Clark. With a vase-like chitinous 

 lorica to which stalked or stalkless organism is attached; fresh or 

 salt water. Numerous species. 



