86 HANDBOOK OF PROTOZOOLOGY 



monads. In this the flagellum is lost and a silicious wall is 

 secreted around the cyst. There is usually an opening with 

 a plug. 



This group is divided into the following three suborders: 



Motile stage dominant Suborder 1 Euchrysomonadina 



Palmella stage dominant 



Sarcodina-like; flagellate stage unknown Suborder 2 Rhizochrysidina 



Palmella phase dominant Suborder 3 Chrysocapsina 



Suborder 1 Euchrysomonadina Pascher 



With one anterior flagellum Family 1 Chromulinidae 



With two equal flagella Family 2 Isochrysidae 



With two unequal flagella Family 3 Ochromonadidae 



With calcareous discs and rods Family 4 Coccolithophoridae 



With simple skeleton Family 5 Silicoflagellidae 



Family 1 Chromulinidae Senn 



Minute forms, naked or with sculptured shell; with a single 

 flagellum; often with rhizopodia; a few colonial. Free-swim- 

 ming or attached. Some fifteen genera. 



Genus Chrysapsis Pascher. Chromatophores diffused or in a 

 network. With stigma; amoeboid locomotion. 



Chrysapsis sagene Pascher (Fig. 30, a). Body about 10 mi- 

 crons long; flagellum about 30 microns long. Fresh water. 



Genus Chromulina Cienkowski. Body minute, ovoid. With 

 one or two chromatophores. A single flagellum. Cysts possess a 

 plug. Several species in clean fresh water. The presence of a 

 large number of organisms sometimes gives a golden-brown 

 color to the surface of the water. 



Chromulina pascheri Hofeneder (Fig. 30, b-d). Body diam- 

 eter about 15 to 20 microns. 



Genus Chrysococcus Klebs. Shell spheroidal or ovoidal, 

 smooth or sculptured and often brown-colored. Through an 

 opening a flagellum protrudes. One or two chromatophores. 

 One of the daughter individuals formed by binary fission leaves 

 the parent shell and forms a new one. 



Chrysococcus ornatus Pascher (Fig. 30, e). In fresh water. 

 About 15 microns long. 



Genus Mallomonas Perty. Body elongated; with silicious 



