220 PROTOZOOLOGY 



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

 brane drawn out into 2 horns. 



C. steini K. (Fig. 100, d, e). Stigma beneath sulcus; chromato- 

 phores brown; swarmer about 45ju 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 

 envelope; fresh water. Many species. 



G. cinctum E. (Fig. 100, /). Spherical to ovoid; annulus equa- 

 torial; stigma horseshoe-shaped; 43/x by 40/i. 



G. pulvisad'um Stein (Fig. 100, g). No stigma; 38At by 30^:. 



G. uliginosum Schilling (Fig. 100, h). 36-48/z by 30/i. 



G. edax S. (Fig. 100, i). Mix by 33^^. 



G. neglectum S. (Fig. 100, j). 30-32^ by 29/x. 



Family 2 Pronoctilucidae Lebour 



Genus Pronoctiluca Fabre-Domergue. Body with an antero- 

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



P. tentaculatum (Kofoid et Swezy) (Fig. 101, a). About 54/i 

 long; off California. 



Genus Oxyrrhis Dujardin. Subovoidal, asymmetrical posterior- 

 ly; annulus incomplete; salt water. 



0. marina D. (Fig. 101, 6). 10-37^ long. 



Family 3 Pouchetiidae Kofoid et Swezy 



Ocellus consists of lens and melanosome (pigment mass) ; sulcus 

 and annulus somewhat twisted; pusules usually present; cyto- 

 plasm colored; salt water (pelagic). 



Genus Pouchetia Schiitt. Nucleus anterior to ocellus; ocellus 

 with red or black pigment mass with a red, brown, yellow, or 

 colorless central core; lens hyahne; body surface usually smooth; 

 holozoic; encystment common; salt water. Many species. 



P.fusus S. (Fig. 101, c). About 94ju by 41^; ocellus 27m long. 



P. maxima Kofoid et Swezy (Fig. 101, d). 145^ by 92/x; ocellus 

 20iu; off California. 



Genus Protopsis Kofoid et Swezy. Annulus and sulcus similar 

 to those of Gymnodinium or Gyrodinium ; with a simple or com- 

 pound ocellus, no tentacles; body not twisted; salt water. A few 

 species. 



