The Mastigophora 135 



,ro 







Fig. 4, 14. A-C. Rhizochloris arachnoidcs Carter (after C). A. Flagellate 

 stage, x2180. B. Amoeboid stage, x2080. C. Amoeboid stage, xl540. D-G. Myxo- 

 chloris spliagnicola, diagrammatic (after Pascher): flagellate stage (D), Plas- 

 modium endoparasitic in Sphagiiiim (E), developing cyst (F) and mature cyst 

 (G). H. Stipitococcus capense Prescott and Croasdale, x665 (after P. & C.). 



15, L). In Cryptomonas (Fig. 4. 15, I-K) the posterior part of the pharynx 

 is closed ventrally to form a pouch, leaving the anterior portion an open 

 furrow. The wall of the pharynx and the groove is lined with refractile 

 granules ("trichocysts"), usually visible in the living organism. These 

 inclusions disappear in old cysts of Cryptomonas (110). The pharynx of 

 the holozoic genus Cyathomonas is a pouch extending posteriorly and 

 ventrally from the anterior end of the body, and partly encircled an- 

 teriorly by an incomplete ring of trichocysts. 



One, two, or more chromatophores have been reported. The single 

 chromatophore of Cryptomonas (Fig. 4. 15, 1) and similar types is bilobed, 

 a condition interpreted occasionally as two separate chromatophores. 

 The chromatophore is usually brown, less commonly green, blue-green, 

 or red. Storage of starch and lipids is characteristic. The colorless Chilo- 

 monas Paramecium synthesizes amylopectin and ^-amylose (117), and 

 pectins have been reported in the endocyst in Cryptomonas (110). 



Three families have been recognized: Cryptochrysidae, Cryptomo- 

 nadidae, and Nephroselmidae. 



Family 1. Cryptochrysidae. The pharyngeal groove, along which rows 



