FLAGELLATE PROTOZOA (MASTIGOPHORA) 



259 



127(124) Colony free, not enclosed by jelly. . ..... Hirmidium 



Representative species Hirmidium inane Perty 1852. 



As many as eleven individuals may be included in the colony. Un- 

 der the name Desmarella irregularis, Stokes describes a form with fifty 

 individuals. Length of body, reported by Stokes, 8 to 12 /* Pond 

 water. 



FIG. 421. Hirmidium inane. Colony X 155; single zooid X 325. (After Stein.) 



128(123) With stalks. ........; . . . 129 



129 (130) Stalk simple; many individuals borne at the end of the stalk. 



Codosiga James-Clark. 

 Representative species. . . . Codosiga botrytis Ehrenberg 1838. 



Bodies ovate; pedicel slender, rigid. Flagellum long. Collar 

 equalling the body in length. Length of zooid 10 to 15 p. Attached 

 to aquatic plants. 



Kent reports that previous to encystment the collars and flagella 

 of this species may be withdrawn into the protoplasm of the bodies, 

 while the latter become covered with radiating pseudopodia. Occa- 

 sionally the pseudopodia are produced while the collar is still ex- 

 tended. Spores are formed during encystment. 



FIG. 422. Codosiga botrytis. X 350. (After Kent.) 



130 (129) Stalk branched, with single individuals or groups on the end of 



each branch Codonocladium Stein. 



Representative species. . Codonocladium umbellatum Tatem 1868. 



Kent would refer this species to the genus Codosiga, in which 

 genus some forms possess zooids with short pedicels attached to the 

 end of the main stalk. 



FIG. 423. Codonocladium umbellatum. X 500. (After Conn.) 



131 (i) Plant characteristics evident; chromatophores usually present; often 



producing colonies. . Class Phytomastigophora . . 132 



132 (205) Body without a shell formed of plates; chromatophores yellow, 



brown, or green. . . . Subclass Phytoflagellata . . 133 



133 (164) Chromatophores usually yellow or brown. 



Order Chrysoflagellida . . 134 



*34 ( J 37) Body usually naked but may be enclosed in a jelly mass during 

 resting stages 135 



