314 PROTOZOOLOGY 



sap ro zoic; the majority are deep-sea forms; a few coastal or fresh 

 water forms also occur. 



With a cellulose membrane Family 1 Cystodiniidae 



Without shell 



Furrows rudimentary Family 2 Pronoctilucidae 



Annulus and sulcus distinct 

 Solitary 



With ocellus Family 3 Pouchetiidae (p. 316) 



Without ocellus 



With tentacles Family 4 Noctilucidae (p. 316) 



Without tentacles 



Free-living Family 5 Gymnodiniidae (p. 318) 



Parasitic Family 6 Blastodiniidae (p. 321) 



Permanently colonial Family 7 Polykrikidae (p. 324) 



Family 1 Cystodiniidae Kofoid and Swezy 



Genus Cystodinium Klebs. In swimming phase, oval, with ex- 

 tremely delicate envelope; annulus somewhat acyclic; cyst-mem- 

 brane drawn out into 2 horns. Species (Pascher, 1928; Thompson, 

 1949). 



C. steini K. (Fig. 126, d, e). Stigma beneath sulcus; chromato- 

 phores brown; swarmer about 45^ long; freshwater ponds. 



Genus Glenodinium Ehrenberg. (Glenodiniopsis, Stasziecella 

 Woloszynska). Spherical; ellipsoidal or reniform in end-view; an- 

 nulus a circle; several discoidal, yellow to brown chromatophores; 

 horseshoe- or rod-shaped stigma in some; often with gelatinous en- 

 velope; fresh water. Many species (Thompson, 1950). 



G. cinctum E. (Fig. 126,/). Spherical to ovoid; annulus equatorial; 

 stigma horseshoe-shaped; 43 ai by 40/x. Morphology and reproduction 

 (Lindemann, 1929). 



G. pulvisculum Stein (Fig. 126, g). No stigma; 38/x by 30ju. 



G. uliginosum Schilling (Fig. 126, h). 36-48m by 3G> 



G. edax S. (Fig. 126, i). 34/x by 33/x. 



G. neglectum S. (Fig. 126, j). 30-32 M by 29 M . 



Family 2 Pronoctilucidae Lebour 



Genus Pronoctiluca Fabre-Domergue. Body with an antero- 

 ventral tentacle and sulcus; annulus poorly marked; salt water. 



P. tentaculatum (Kofoid and Swezy) (Fig. 127, a). About 54ju long; 

 off California coast. 



Genus Oxyrrhis Dujardin. Subovoidal, asymmetrical posteriorly; 

 annulus incomplete; salt water. 



0. marina D. (Fig. 127, 6). 10-37/x long. Division (Dunkerly, 1921; 

 Hall, 1925). 



