122 The Mastigophora 



apparently may differ in this respect. Some colorless species (Fig. 4. 3, E) 

 also have a stigma. Scattered granules, similar in color to the stigma, have 

 been reported in Dinobryon, Mallomonas, and other genera (247). 



Solid food is ingested by certain pigmented species as well as colorless 

 types (Fig. 4. 3), and ingestion often involves formation of a food-cup 

 in a particular region. Refractile granules of leucosin (Fig. 4. 1, B-F) and 



Fig. 4. 4, Apochlorotic colonial types. A, B. Cladonema pauperum 

 Pascher; portion of colony and a single flagellate; schematic (after P.). C, D. 

 Codoiwdendrnn ocellatum Pascher; portion of the Diuobryon-\i\^e colony, 

 and a single flagellate showing stigma and ingested food; schematic (after 

 P.). E, F. Monadodendrnn distans Pascher; portion of a colony and a single 

 flagellate; schematic ('after P.). 



globules of oil or fat (Fig. 4. 1, A) are stored. Leucosin is sometimes con- 

 sidered a polysaccharide but its chemical nature has not been determined. 

 Colonial organization is fairly common. Arboroid types include Hyalo- 

 bryon (Fig. 1. 2), Dinobryon, Codonodendron (Fig. 4. 4, C) and certain 

 other loricate genera and also such naked forms as M onadodendron (Fig. 

 4. 4, E) and Cladonema (Fig. 4. 4, A). Spheroid colonies are developed in 

 Synura (Fig. 4. 5, C), Cyclonexis (Fig. 4. 5, A, B), Syncrypta (Fig. 1. 2, F) 

 and ChrysosphaereJla (Fig. 4. 5, D), among others. 



