one nucleus, which is situated
a little above the body center. Fresh and salt water. Length without
collar 9 mu; length of collar 3 mu.

[Illustration: Fig. 11.--_M. fusiformis_.]

Genus CODONOSIGA (Jas. Clark '67).

(Buetschli '78; Kent '81; France '97; Senn 1900.)

This genus, as modified by France, is distinguished from the
preceding by the possession of an unbranched stalk much longer than
the body length. The body is naked and of various shapes, and the
individuals are solitary or colonial upon a single stalk. Kent '81
enumerates no less than 10 species, which were cut down by Buetschli
to 1. France admits 4--_C. botrytis_ Jas. Clark; _C. grossularia_;
_C. pyriformis_, and _C. furcata_, all S. Kent--but regards the
second and third as merely form varieties of the first.

Codonosiga botrytis (Ehr. sp.) Jas. Clark '67. Fig. 12.

France gives the following synonyms: _Epistylia botrytis_ Ehr.;
_E. digitalis_ Stein, _Zoothamnium parasitica_ Stein; _Anthophysa
solitaria_ Fresenius; _Codonosiga pulcherrima_ Jas. Clark; _Monosiga
gracilis_ S. Kent; _M. globulosa_ S. Kent; _Codonosiga pyriformis_
Kent; _C. grossularia_ Kent; (France).

The individuals are small and provided with a long unbranched, or
terminal, simply split stalk. The individuals are single or colonial.
The Woods Hole form measured 22 mu over all; the body was 5 mu, the
collar 3 mu, and the stalk 14 mu. No colonies were seen, and only a few
individuals upon red algae.

[Illustration: Fig. 12.--_Codonosiga botrytis_.]

Genus BODO (Ehr.) Stein.

(Stein '59, Buetschli '83; Klebs '92; Senn 1900.)

The body is naked, usually amoeboid in its changes, and provided with
two flagella, one of which is usually trailed along under and behind
the animal. The anterior end is usually pointed, with the flagella
arising from a minute depression; the posterior end is rounded.
Specific characters very difficult to analyze. Fresh and salt water.

Bodo globosus Stein. Fig. 13.

The body during movement is globular or ovoid, without any anterior
process. The trailing flagellum is invariably much longer than the
vibratory one. The contractile vacuole lies in the anterior half of
the body. Solid food particles are taken in near base of flagella.

Length of body 9 to 12 mu; diameter 8 to 11 mu. Common.

[Illustration: Fig. 13.--_Bodo globosus_.]

Bodo caudatus (Duj.) Stein. Fig. 14.

Synonyms: _Amphimonas caudatus_ Duj.; _Diptomastix caudata_