456 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Genus DIOPHRYS Dujardin ’41. 
(Biitschli ’88.) 
Medium size, colorless to yellow, rigid in form. The body contour is oval, the anterior end being 
rounded or slightly reduced, the posterior end usually cut in on the right- side. The peristome is 
broad but less extensive than in Euplotes, and may extend beyond the middle of the body. Its right 
edge is convex toward the right side, extends forward and does not turn again to the right. The 
anterior ventral surface has 7 to 8 scattered cirri and just behind the mouth is a transverse row of 
large anal cirri. In the sharp in-cut of the posterior end are three great angular cirri. Two lateral 
cirri are placed on the left of the median line between the mouth and the anal cirri, and usually in 
a slight hollow. The contractile vacuole is on the right side in the vicinity of the anal cirri. The 
macronueleus is in two parts, each band-form, one anterior, the other posterior in position. Movement 
is rapid and steady. Salt water. 
Diophrys (Styloplotes) appendiculatus Stein ’59. Fig. 54. 
Synonyms: Styloplotes appendiculatus Stein ’59; Kent '81; Quennerstedt ’67, etc. 
The general form resembles Euplotes. Its outline is oval and regular except at the posterior end 
on the right side, where there is a considerable indentation. The frontal margin is characterized by 
a row of powerful membranelles, which become smaller at the peristome and at the mouth they are 
of characteristically small size. The ventral cirri are 7 in number. Five of them are in one row from 
the anterior end down the right side nearly to the anal cirri; 1 is on the frontal border between the 
first two; 1 lies just anterior to the second anal cirrus from the right side. The 5 anal cirri are large 
and powerful and extend some distance beyond the posterior end of the body. In all specimens 
observed these cirri curve to the left. Dorsal to the anal cirri and placed deep into the dorsal pit 
are 3 large, sharply curved cirri, which in most cases are fimbriated, but when the specimens are 
