marginal, and 2 left marginal
cirri

No frontal, 5 anal, 3 right, Genus *_Uronychia_
and 2 left marginal cirri

* Presence at Woods Hole indicated by asterisk.


Genus EUPLOTES (Ehr. 1831) Stein '59.

(Ehrenberg '31, '38; Stein '59; Cl. & Lach. '58; Quennerstedt '65,
'67, '69; Bütschli '88; Kent '81; Gourret & Roeser '88; Möbius '88.)

Small to medium-sized forms. Rigid in form, colorless, or green by
chlorophyl. They are quite flat on the ventral surface but decidedly
arched dorsally, and the contour is usually oval. The anterior end is
broadly rounded to truncate; the posterior end is similarly rounded,
or may be somewhat pointed. The mouth is placed centrally or near
the left margin, and from it the right edge of the peristome forms a
curved line to the left, which bends forward, thus making the greater
part of the left edge the peristomial area. In front the peristome
bends sharply to the right and extends as far as the right end of the
adoral zone. Upon the frontal and median ventral surface are 9 to 10
great cirri (_Bauchwimpern_ of Stein). Posteriorly five great anal
cirri stretch out beyond the posterior body margin. In addition to
these there are two smaller marginal cirri upon the left body edge,
and two similar ones on the hinder part of the body. The dorsal
surface is rarely smooth, but usually is marked by longitudinal
ridges, and rows of dorsal bristles have been described. The single