FLAGELLATE PROTOZOA (MASTK;OPHORA) 



245 

 16 



15(4) Often forming colonies and often with lorica 



16 (21) Lorica present Family Bikoecidak 17 



17 (20) Not forming colonies 18 



18 (19) Body attached in lorica by thread-like peduncle; with peristome 

 process. Two flagella Bicosoeca James-Clark. 



Representative species Bicosoeca lepteca Stokes 1885. 



/ 



Lorica subcylindrical with a very short neck in front; drawn out to an acute 

 point where attachment is made with the pedicel. Body ovate, ol)liquely 

 truncate in front and projecting slightly beyond the margin of the lorica when fully 

 extended. Flagella unequal. Nucleus near the middle of the body; two con- 

 tractile vacuoles. A chestnut-brown color of the lorica indicates old age. Length 

 of lorica 15 to 18 m- Pond water among algae. 



Fig. 368. Bicosoeca lepteca. cv, contractile vacuole; n, nucleus. X 840. (.\fter Stokes.) 



Body not attached by thread-like peduncle, no peristome process. 



Flagellum single Codonoeca James-Clark. 



Representative species Codonoeca inclinata Kent 1880. 



Lorica ovate, attached obliquely to a pedicel twice its length. Body attached 

 to the posterior, inner surface of the lorica without a peduncle. Not projecting 

 beyond the margin of the lorica. Flagellum extending considerably beyond 

 the aperture. A nucleus and a contractile vacuole in the posterior regi(jn of 

 the body. Length of lorica 15 m- Pond water. 



Fig. 369. Codonoeca inclinata. cv, contractile vacuole. X 810. (.\fter Kent.) 



20 (17) Forming colonies, with peristome projection. 



r.^./^ Slylohryon de Fromentel. 



~ Representative species. . . ^/y/oftryo/z />t'//(;/(i//<m Dujardin 1838. 



Each lorica wineglass-shaped, pointed posteriorly, attached to a pKxliccl 

 which arises from within the cavity of the associated lorica. Body plastic. 

 Flagella two, unequal in length. Length of lorica },o to 50 m- I'i>nd water. 

 Often subdividing by spores. 



Fig. 370. Stylobryon pciiolatum. cv, contractile vacuole; «, nucleus. X 75- (After Kent 



