270 PROTOZOOLOGY 



D. irregularis Stokes. Cluster of individuals irregularly branching, 

 composed of more than 50 cells; cells 7-1 Iju long; pond water. 



Genus Protospongia Kent. Stalkless individuals embedded irregu- 

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



P. haeckeli K. (Fig. 116, g). Body oval; 8/i long; flagellum 24-32^ 

 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. 116, h). Cells ovoid, 8-12jli long; stalk about 

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

 82-200/i 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. 116, i). With a short pedicel; 12ju 

 long; flagellum as long as body. 



D. socialis F. (Fig. 116, j). Body about IS/x long; usually 4 clus- 

 tered at one end of stalk (15/i 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-like 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; attached or free- 

 swimming. 



B. socialis Lauterborn (Fig. 117, a). Lorica cylindrical, 23^ by 

 12m ; body about lOju 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. 



S. fusiformis Kent (Fig. 117, b). Lorica short vase-like, about 15- 

 16/Lt long; body filling lorica; flagellum as long as body; fresh water. 



Genus Diplosigopsis France. Similar to Diplosiga but with 

 lorica; solitary; fresh water on algae. 



D. affinis Lemmermann (Fig. 117, c). Chitinous lorica, spindle- 

 form, about 15m long; body not filling lorica; fresh water. 



Genus Histiona Voigt. With lorica; but body without attaching 

 filament; anterior end with lips and sail-like projection; fresh water. 



