SPIROTRICHA, HYPOTRICHA 843 



Genus Certesia Fabre-Domergue. Ellipsoid; flattened; dorsal 

 surface slightly convex, ventral surface flat or concave; 5 frontals 

 at anterior border; 7 ventrals; 5 anals; no caudals; marginals small 

 in number; 4 macronuclei; salt water. One species. 



C. quadrinucleata F.-D. (Fig. 358, e). 70-100m by about 45/i. 

 Morphology (Sauerbrey, 1928). 



Genus Diophrys Dujardin. Peristome relatively large, often 

 reaching anals; 7-9 frontal-ventrals; 5 anals; 3 strong cirri right- 

 dorsal near posterior margin; salt water. 



D. appendiculata (Ehrenberg) (Fig. 358, /). 60-lOOyu long; salt 

 water; Woods Hole (Calkins). Division and reorganization (Sum- 

 mers, 1935). 



Genus Uronychia Stein. Without frontals and ventrals; 5 anals; 

 3 right-dorsal cirri (as in Diophrys); 2 left-ventral cirri near posterior 

 margin; peristome, oval with a large undulating membrane on 

 right edge; salt water. Several species. 



U. setigera Calkins (Fig. 358, g). 40/z by 25/z; salt water; Woods 

 Hole. 



Genus Gastrocirrhus Lepsi. Anterior end truncate with a ring of 

 cilia; posterior end bluntly pointed; slightly flattened; a wide peri- 

 stome leading to cytostome, with undulating membrane on left; 16 

 cirri on ventral surface arranged on right and posterior margins 

 (Lepsi) or six frontals, five ventrals, five caudals (Bullington) ; ma- 

 rine. Apparently intermediate between Heterotricha and Hypo- 

 tricha (Lepsi). 



G. stentoreus Bullington (Fig. 359, a). About 104^ by 71-8 1/t; dark 

 granulated cytoplasm; active jumping as well as swimming move- 

 ment; in Tortugas (Bullington, 1940). 



Family 3 Paraeuplotidae Wichterman 



Genus Paraeuplotes Wichterman. Ovoid; ventral surface slightly 

 concave, dorsal surface highly convex and bare, but with one ridge; 

 frontal and adoral zones well developed ; ventral surface with a semi- 

 circular ciliary ring on the right half, posterior half of which is 

 marked by a plate and with two ciliary tufts, near the middle of an- 

 terior half; 5-6 caudal cirri; macronucleus curved band-form; a 

 terminal contractile vacuole; zooxanthellae, but no food vacuole in 

 cytoplasm; marine, on the coral. 



P. tortugensis W. (Fig. 359, b, c). Subcircular to ovoid; average 

 individuals 85/z by 75/x; ciliary plate 37 /jl long, with longer cilia; 

 adoral zone reaches nearly the posterior end; "micronucleus not 

 clearly differentiated" (Wichterman); 5-6 caudal cirri about 13/* 



