Marine Protozoa from Woods Hole | Page 6

and _M. augustata_. Fresh and
salt water.
Monosiga ovata S. Kent '81. Fig. 10.
Synonyms: M. brevipes S. K.; M. consociata S. K.; M. limnobia
Stokes.
The individuals are unstalked or provided with a very short stalk less
than the body in length. The form is spherical or ovate, broadest at the
base and tapering to the extremity. The collar is somewhat variable in
size. In the Woods Hole forms it was about the length of the body. Oil
particles present. Contractile vacuole posterior, nucleus anterior.
Fresh and salt water. Length of body without the collar 5µ.
[Illustration: Fig.10.--Monosiga ovata.]
Monosiga fusiformis S. K. Fig. 11.
Synonyms: M. steinii S. K.; M. longicollis S. K.
The individuals are unstalked, minute, and of a general flask-shape.
The body is swollen centrally and tapers slightly at each end. There is
no stalk, the body being fixed by the attenuate posterior end. There are

two contractile vacuoles and one nucleus, which is situated a little
above the body center. Fresh and salt water. Length without collar 9µ;
length of collar 3µ.
[Illustration: Fig. 11.--M. fusiformis.]
Genus CODONOSIGA (Jas. Clark '67).
(Bütschli '78; Kent '81; Francé '97; Senn 1900.)
This genus, as modified by Francé, 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 Bütschli to 1. Francé 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.
Francé 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; (Francé).
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 22µ over all; the body was 5µ, the collar
3µ, and the stalk 14µ. No colonies were seen, and only a few
individuals upon red algæ.
[Illustration: Fig. 12.--Codonosiga botrytis.]
Genus BODO (Ehr.) Stein.
(Stein '59, Bütschli '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 12µ; diameter 8 to 11µ. Common.
[Illustration: Fig. 13.--Bodo globosus.]
Bodo caudatus (Duj.) Stein. Fig. 14.
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.
Oxyrrhis marina Duj. Fig. 15.
With the characters of the genus. Contractile vacuole not seen. Length
28 to 40µ.
[Illustration: Fig. 15.--Oxyrrhis marina.]
Genus ASTASIA Ehr.
Flagellates with one flagellum, a spindle-form body and a high degree
of plasticity, the contour constantly changing. A distinct, usually
striped cuticle is invariably present. "Eye-spots" are absent. Fresh and
salt water.
Astasia contorta Duj. Fig. 16.
Astasia inflata Duj. '41.
The body is colorless, transparent, and flexible. It is largest in the
center, thence tapering at the two extremities. The surface of the cuticle
is obliquely striated, giving to the animal a distinctly twisted
appearance.