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 normal these are pointed and curve abruptly to the
right. Two smaller cirri lie to the left of the group of anal cirri.
The peristome is well-marked by the adoral zone, and upon its right
border there is a row of cilia, and a similar row of cilia runs along
the base of the oral membranelle. The macronucleus is double and
consists of two elongate cylindrical masses lying parallel with
one another. One of these is in the anterior region; the other is
posterior. The contractile vacuole lies dorsal to the anal cirri
and anterior to the three dorsal cirri. The movement and general
activities resemble those of _Euplotes_.

Length 50µ; diameter 25µ.


[Illustration: Fig. 54.--_Diophrys appendiculatus_.]


Genus URONYCHIA Stein '52.

(Stein '59, '67; Quennerstedt '67; Kent '81; Bütschli '88.)

Medium-sized colorless ciliates of usually constant body form. The
body is somewhat short and oval in outline. The anterior end is
broadly truncate, the posterior end rounded or slightly pointed. The