302 BIOLOGY OF THE PROTOZOA 



2. Chroma tophores l)lue to blue-green 3 



Chronmtophores brown, red, or green 4 



3. One or two large chroniatophores . . .Genus Chroomonas 

 Many small, discoidal chroniatophores 



Genus Cyanomonas 



4. Chroniatophores green or brown, rarelj^ 



reddish Genus Cryptochnjsis 



Chroniatophores red, usually smgle. Genus Rhodomonas 



5. Chroniatophores yellow 6 



Colorless forms ; no chroniatophores 7 



6. Free-living forms; two lateral chroniato- 



phores Genus Cryptomonas 



Symbiotic; "yellow cells" in part, of Fora- 

 ' minifera Genus Chrysidella 



7. Flagella (two) from center of anterior end ; 



saprozoic Genus Chilomonas 



Flagella at corner of anterior end ; holozoic 



Genus Cyathomonas 

 Family 2. Nephroselmidae. 



Furrow antl stigma distinct; no gullet. .Genus Protochrysis 

 Furrow indistinct ; with gullet ; no stigma 



Genus Nephroselmis 



Sub-order 2. Phseocapsina. 



Gelatinous masses irregular; no threads 



Family 1. Pn^ocAPSiDiE 

 Gelatinous masses branched ; with long hairs 



Family 2. Ph.eothamnionid^ 

 Family 1. Phaeocapsidse. 



One genus with family characters Genus NcegeUella 



Family 2. Phseothamnionidse. 



One genus with family characters Genus Phceothamnion 



Order III. DINOFLAGELLIDA. 



Body naked or shelled; girdle and sulcus at 



some stage Sui)-order Diniferin a 



Naked or with bivalve shell; no sulcus, no 



girdle Sub-order Adinina 



Naked; no sulcus or girdle; no transverse 



flagellum Sub-order Cystoflagellina 



Sub-order 1. Diniferina. 



1. Naked or with delicate one-piece shell; 



girdle and sulcus distinct at some stage 



Tribe 1. Gymnodinioid.e 

 With skeletal elements, plates or membrane 2 



2. No enveloping cuirass; skeletal elements 



embedded or superficial Tribe 2. Amphilothioid.e 



With theca or cuirass; epitheca and hypo- 



theca separated by girdle plates Tribe 3. Peridinioid.e 

 Tribe 1. CIymnodinioid.e 



1. With delicate one-piece cellulose shell 



Genus Glenodinmm 

 Body without shell, naked 2 



