FLAGELLATE PROTOZOA (MASTIGOPHORA) 



245 



15(4) Often forming colonies and of ten with lorica 16 



16(21) Lorica present Family BIKOECIDAE . . 17 



17 (20) Not forming colonies 18 



1 8 (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, obliquely 

 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 /*. Pond water among algae. 



FIG. 368. Bicosoeca lepteca. cv, contractile vacuole; n, nucleus. X 840. (After 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 region of 

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



FlG. 369. Codonoeca inclinata. cv, contractile vacuole. X 810. (After Kent.) 



20 (17) Forming colonies, with peristome projection. 



Stylobryon de Fromentel. 

 Representative species. . . Stylobryon petiolatum Dujardin 1838. 



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

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

 Flagella two, unequal in length. Length of lorica 30 to 50 ?. Pond water. 

 Often subdividing by spores. 



FIG. 370. Stylobryon petiolatum. cv, contractile vacuole; n, nucleus. X 75- (After Kent.) 



