Synonyms: _Amphimonas caudatus_ Duj.; _Diptomastix caudata_ Kent.

The body is variable in shape, but usually flattened and pointed
posteriorly. An anterior process is almost always present, and
below this the flagella are inserted in a minute depression. The
contractile vacuole is close to the base of the flagella. The
flagella are about the same size, the anterior one usually somewhat
longer. Common. Length 12 to 18µ.

This species was seen by Peck '95 and described as a small
flagellate.


[Illustration: Fig. 14.--_Bodo caudatus_.]


Genus OXYRRHIS Duj.

(Kent '81; Bütschli '86; Klebs '92; Senn 1900.)

Medium-sized forms, somewhat oval in shape, with a rounded posterior
end. The anterior end is continued dorsally in a somewhat attenuate
pointed process. At the base of this process is a large cavity or
funnel, on the dorsal wall of which, or on a projection from this
wall, are two equal-size flagella. When at rest, the flagella are
directed backwards. The nucleus is central. In moving, the posterior
end is invariably in advance. This genus is exceptional among
Mastigophora in that division is transverse instead of longitudinal.