r '84;
Gourret & Roeser '86, and others.)

Small to medium-sized forms. The distinguishing feature is that the
stalk is swollen at the distal extremity to form a cup or basin in
which the animal rests. The cup may be developed until the body is
nearly inclosed. The macronucleus is spherical or band form. The
contractile vacuole is usually single. Budding, so far as known, is
endogenous. Fresh and salt water.

Acineta divisa Fraipont '79. Fig. 67.

This extremely graceful form is common on Bryozoa at Woods Hole. The
cup is shaped like a wine glass and is specifically characterized by
a cup-formed membrane upon which the animal rests. The animal thus
has the appearance of being suspended on the edge of the cup. The
stalk is slender and about 4 times the length of the body. The
tentacles are all capitate and distributed, and about 2-1/2 times the
body length. They sway back and forth very slowly. The nucleus is
spherical and central in position. The contractile vacuole lies near
the periphery.

Length of body 27 mu; of stalk 100 mu; of extended tentacle 65 mu.

[Illustration: Fig. 67.--_Acineta divisa_.]

Acineta tuberosa Ehr. Fig. 68.

Large forms of _Suctoria_ with tentacles arranged in fascicles. The
stalk is variable in length and the cup is frequently so delicate
that it can barely be made out. A specific characteristic is the
break in continuity of the cup at different points, and through these
places the tentacles emerge in bundles. The tentacles are capitate
and in the Woods Hole form, 15 in number in each of the two bundles.
The endoplasm is granular and yellowish in color. The coloring matter
is frequently arranged in patterns. The nucleus is spheroidal. The
contractile vacuole is in the anterior third of the body about midway
between the bundles of tentacles. Reproduction not observed.

Length of body 330 mu.

[Illustration: Fig. 68.--_Acineta tuberosa_.]

Genus TRICHOPHRYA Clap. & Lach. '58.

(See Kent '81; Entz '84; Buetschli '88; Sand 1901.)

Small forms to medium size; no cups or stalks. The body is spherical
to elongate, usually, however, more or less irregularly lobed and
changeable. The tentacles are in fascicles which are usually borne
upon lobed or swollen places. The body is always more or less spread
out. Contractile vacuoles variable. The macronucleus is spherical,
elongate, band-formed or horseshoe-shaped. Reproduction takes place
by endogenous budding, and the swarm spor