102 HANDBOOK OF PROTOZOOLOGY 



Furrows rudimentary Family 2 Pronoctilucidae 



Annulus and sulcus distinct 

 Solitary 



With ocellus Family 3 Pouchetiidae 



Without ocellus 



With tentacles Family 4 Noctilucidae 



Without tentacles 



Free-living F"amily 5 Gymnodiniidae 



Parasitic Family 6 Blastodiniidae 



Permanently colonial Family 7 Polykrikidae 



Family 1 Glenodiniidae Lebour 



Shell composed of epitheca, annulus, and hypotheca; not 

 divided into plates nor marked by sutures. Chiefly freshwater 

 forms. One genus. 



Genus Glenodinium Ehrenberg. Body spherical; ellipsoidal 

 or reniform in end-view; several discoidal yellow to brown 

 chromatophores. Horseshoe- or rod-shaped stigma. 



Glenodinium uliginosum Schilling (Fig. 35, a). 36 to 43 

 microns long. Fresh water. 



Family 2 Pronoctilucidae Lebour 



( = Protodiniferidae Kofoid and Swezy) 



Genus Pronoctiluca Fabre-Domergue. Body with an an- 

 terior tentacular process and sulcus; annulus poorly marked. 

 Marine. 



Pronoctiluca tentaculatum (Kofoid and Swezy) (Fig. 35, b). 

 About 54 microns long. Marine. 



Genus Oxyrrhis Dujardin. Body oval, asymmetrical pos- 

 teriorly. Girdle incomplete. Marine. 



Oxyrrhis marina Dujardin (Fig. 35, c). Body 22 to 32 mi- 

 crons long. 



Family 3 Pouchetiidae Kofoid and Swezy 



Ocellus consists of lens and melanosome (pigment mass). 

 Sulcus and annulus somewhat twisted. Pusules usually present. 

 Pelagic. Several genera. 



Genus Pouchetia Schiitt. Nucleus anterior to ocellus. Cyto- 

 plasm is colored. Holozoic. Cyst frequent. Pelagic. 



Pouchetia fusus Schiitt (Fig. 2>S,d). About 100 microns long. 



