in width. There are two rows of marginal cirri (_Randcirren_), which
may be placed some distance from the edge, and two or three rows of
ventral cirri between them. There are from 3 to 5 frontal cirri of
larger size than those of the ventral rows, and from 5 to 10 anal
cirri. (The genus _Holosticha_ is similar in all respects save
the presence of frontal cirri.) The macronucleus is double; the
contractile vacuole is central and on the left side. The peristome
is long and rather narrow and carries an undulating membrane on its
right margin. Fresh and salt water.


Amphisia kessleri Wrzes. '77. Fig. 51.

Synonyms: _Trichoda gibba_ Müller; _Oxytricha gibba_ Stein '59; _O.
velox?_ Quen. '69; _O. kessleri_ Wrzes. '77.

Body elongate, slightly sigmoid and swollen in the center, about
3-1/2 times as long as broad; the rounded anterior end is turned to
the left, the similarly rounded posterior end to the right; both ends
taper slightly. The peristome is long and narrow, with a distinct
adoral zone which appears broken in its course. To the right of this
adoral zone is a single line of preoral cilia. On the right border of
the peristome is an undulating membrane. The three frontal cirri form
a triangle and the five smaller anal cirri form a continuous line
with the broken row of ventral cirri. There are two and one-half rows
of ventral cirri and the marginal cirri are drawn in until they are
ventral in position.

Length 135µ; greatest width 40µ.