PLASMODROMA, MASTIGOPHORA, CHRYSOMONADIDA 91 



Genus Rhizochrysis Pascher. Body naked and amoeboid; 

 with one or two chromatophores. 



Rhizochrysis scherffeli Pascher (Fig. 31,/). 



Suborder 3 Chrysocapsina Pascher 



Palmeila stage is prominent. Flagellate forms are transient. 

 Colonial; individuals are enclosed in a gelatinous mass. One 

 or two flagella, one chromatophore, and a contractile vacuole 

 are typically present in each individual. One group of relatively 

 minute forms and the other of large organisms. Among the 

 latter, Ilydrurus foetidus Kirchner (Figs. 15, d-f; 31, g-i) is 

 conspicuous in having a large palmeila stage, which may be 

 cylindrical or dendritic, and which may grow from one to thirty 

 centimeters long. Individuals are arranged loosely in the gelat- 

 inous matrix. Apical growth resembles much higher algae. 

 Multiplication of individuals results in formation of pyramidal 

 forms with a flagellum, a chromatophore, and a leucosin mass. 

 The encysted stage may show a wing-like rim. 



References 



Calkins, G. N. 1926 The biology of the Protozoa. Phila- 

 delphia. 



DoFLEiN, F. AND E. Reichenow. 1929 Lehrbuch der Pro- 

 tozoenkunde. Jena. 



KtJHN, A. 1921 Morphologie der Tiere in Bildern. I. H.; I 

 Teil. Berlin. 



Stokes, A. C. 1888 A preliminary contribution toward a 

 history of the freshwater Infusoria of the United States. 

 Jour. Trenton Nat. Hist. Soc, Vol. 1. 



Geitler, L. 1926 Zur Morphologie und Entwickelungs- 



geschichte der Pyrenoide. Arch f. Protistenk., Vol. 56. 

 LoHMANN, H. 1913 Ueber Coccolithophoriden. Verb. 



Deutsch. Zool. Ges., Bremen. 

 Pascher, A. 1913 Chrysomonadinae. Susswasserflora Deutsch- 



lands, etc. Jena. 

 West, G. S. and F. E. Fritsch. 1927 A treatise on the British 



freshwater algae. Cambridge. 



