SUB-CLASS: PHYTOMASTIGINA 



275 



the intestine of tadpoles, while members of the genus Copromonas are 

 commonly found in stale fa3ces. Following Doflein (1916) the sub-class 

 Phytomastigina is divided into five orders: 



1. Order: CHRYSOMONADIDA. 

 Simple forms of small size which possess chromatophores mostly 

 coloured with a brown pigment. There are one or two flagella. Cysts 



Fig. 123. — Various Chrysomonadida. (From Oltmann, 1922, after 

 Various Authors.) 



1-2. Chri/siinnilia. ni<1i<ins {x 1,000). 5. Cyst oi Chromulina favicans formed endo- 



3. Och'roiiKuias .^uiip/f.rix ca. 400). genously ( x ca. 1,500). 



4. Chronmlnid pnsrhcrl {x ca. 1,500). 6. S;/iicri/'pta volvox, a, co\onia.\iorm {x ca.650). 



7. Pontos'phoerahaeckeli{x 1,600). 



with siliceous walls are formed endogenously within the cytoplasm. The 

 surface of the body may be limited by a rigid membrane, or such a structure 



