316 PROTOZOOLOGY 



Family 3 Pouchetiidae Kofoid and Swezy 



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

 and annulus somewhat twisted; pusules usually present; cytoplasm 

 colored; salt water (pelagic). 



Genus Pouchetia Schutt. Nucleus anterior to ocellus; ocellus with 

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

 central core; lens hyaline; body surface usually smooth; ho lo zoic; 

 en^ystment common; salt water. Many species (Schiller, 1928a). 



P. fusus S. (Fig. 127, c). About 94/t by 41/x; ocellus 27m long. 



P. maxima Kofoid and Swezy (Fig. 127, d). 145/t by 92/*; ocellus 

 20/x; off California coast. 



Genus Protopsis Kofoid and Swezy. Annulus and sulcus similar 

 to those of Gymnodinium or Gyrodinium; with a simple or compound 

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



P. ochrea (Wright) (Fig. 127, e). 55/i by 45/z; ocellus 22/i long; 

 Nova Scotia. 



Genus Nematodinium Kofoid and Swezy. With nematocysts; 

 girdle more than 1 turn; ocellus distributed or concentrated, pos- 

 terior; holozoic; salt water. 



N. partitum K. and S. (Fig. 127, /). 91/* long; off California coast. 



Genus Proterythropsis Kofoid and Swezy. Annulus median; ocel- 

 lus posterior; a stout rudimentary tentacle; salt water. One species. 



P. crassicaudata K. and S. (Fig. 127, g). 70/t long; off California. 



Genus Erythropsis Hertwig. Epicone flattened, less than 1/4 

 hypocone; ocellus very large, composed of one or several hyaline 

 lenses attached to or imbedded in a red, brownish or black pigment 

 body with a red, brown or yellow core, located at left of sulcus; 

 sulcus expands posteriorly into ventro -posterior tentacle; salt water. 

 Several species. 



E. cornuta (Schutt) (Fig. 127, h). 104/x long; off California coast 

 (Kofoid and Swezy). 



Family 4 Noctilucidae Kent 



Contractile tentacle arises from sulcal area and extends poste- 

 riorly; a flagellum; this group has formerly been included in the 

 Cystoflagellata; studies by recent investigators, particularly by 

 Kofoid, show its affinity with the present suborder ; holozoic ; saltwater. 



Genus Noctiluca Suriray. Spherical, bilaterally symmetrical; peri- 

 stome marks the median line of body; cytostome at the bottom of 

 peristome; with a conspicuous tentacle and a short flagellum; cyto- 

 plasm greatly vacuolated, and cytoplasmic strands connect the cen- 

 tral mass with periphery; specific gravity is less than that of sea wa- 



