126 The Mastigophora 



Clirysogleyia Wislouch (207); and the colorless Oikomonas Kent (181; Fig. 4. 3, G). 

 Cyrtophora Pascher and Pedinella AV^ysotzki contain stalked sessile forms (202). In 

 Epicysiis Pascher (211), there is an epiphytic non-flagellated phase and a Chromulina- 

 like stage. In Pyrainidochrysis Pascher, the firm membrane is decorated with three 

 longitudinal flanges, while that of Mihroglena Ehrenberg contains numerous granules 

 (202). These granules may be analogous to the cortical inclusions of Ochromonas 

 pingitis (Fig. 4. 1, J), or possibly represent primitive coccoliths. 



Solitary loricate forms include: Bicoeca Clark, without chromatophores (181); Chryso- 

 coccocystis Conrad (47); LepochromuUna Scherffel (202); Histiona Voigt, colorless forms 

 with a stalked lorica (225); and Palatinella Lauterborn, with several slender pseudopodia 

 ("tentacles") sunounding the flagellum (202). 



A test (or "shell") is present in the following: Chrysococcus Klebs (174; Fig. 4. 2, 

 C), swimming types with a spheroid to ovoid test; Kepfiyrion Pascher (Fig. 4. 2, I), 

 tests with a recognizable neck (51). 



Siliceous plates cover much or all of the body in Mallomouas Perty and Chryso- 

 sphaercUa Lauterborn. Mallomonas (Fig. 4. 2, G) includes about sixty species (45, 48), 

 differing in shape and arrangement of the scales, and in the presence or absence of 

 spines. Chrysosphaerella (Fig. 4. 5, D) includes .spheroid colonial forms. "Pseudomallo- 

 monas Chodat" apparently falls within the limits of the genus Mallomonas (48). 



Loricate colonial types without chlorophyll are included in Codonodendron Pascher 

 (Fig. 4. 4, C, D) and Stephauocodon Pascher (224). In the latter, the simple four- or 

 eight-rayed colonies are formed by the adherence of loricae near their basal ends. Also, 

 Poteriodendron Stein may belong in this group (93). 



Family 2. Syncryptidae. Two flagella of equal length are characteristic. 

 Syncrypta Ehrenberg (Fig. 1. 2, F) includes spherical colonies with the 

 flagellates embedded in a granular matrix (202). In Chlorodesmiis Phil- 

 lips (202), pairs of flagellates, adherent basally, are aligned in simple 

 band-like colonies. The cortex is decorated with spines, perhaps similar 

 to the siliceous scales of Synura. Derepyxis Stokes (Fig. 4. 2, J) includes 

 solitary loricate types (202, 207). 



Family 3. Ochromonadidae. This group, like the Chromulinidae, in- 

 cludes both solitary and colonial forms. Ochromonas Wysotzki (Fig. 4. 1, 

 A, C, D-F) contains flagellates with a flexible periplast permitting changes 

 in shape and sometimes the formation of a temporary protoplasmic 

 "stalk" (Fig. 4. 3, B). A detailed cytological description is available for 

 Ochromonas graniilaris Doflein (66). The colorless homologue of Ochro- 

 monas, the genus Monas Miiller (including Sterromonas Kent and 

 Physomonas Kent) contains at least 13 species (243), some of which have 

 a stigma. The periplast of Monas vestita (Stokes) Reynolds is enclosed 

 in a mucous envelope from which radiate slender mucotis threads (Fig. 

 4. 3, E, F). 



Additional solitary non-loricate types are assigned to the following genera: Ochry- 

 ostylon Pascher, usually sessile with, or sometimes without, a delicate stalk (222); 

 StomatocJione Pascher, colorless, usually sessile with a short protoplasmic stalk (222); 

 Kremastochrysis Pascher (Fig. 4. 6, D-F), with an Ochromoiias-Mke flagellate stage and 

 a dominant non-flagellated form attached to a float which suspends the organism from 

 the surface of the water (223). 



Solitary loricate types are included in several genera. The lorica of the sessile 

 Epipyxis Ehrenberg resembles that in the colonial Dinobryon (Fig. 4. 2, A). A stalked 

 Dmobryon-type lorica is characteristic of Stylnpyxis Bolochonzew (202) and the color- 



