Body naked 3

2. Body inclosed in a shell or coat 7

3. a. Cilia uniform about the entire 4
body; body symmetrical

b. Cilia in the mouth region 5
longer than the others; body
symmetrical

c. Bristles, or tentacles, in 6
addition to cilia

4. Mouth terminal; body ellipsoidal Genus _Holophrya_
to ovoid

5. a. Mouth terminal; body elongate, Genus _Chaenia_
flexible, and elastic

b. Mouth terminal; "neck" highly Genus *_Lacrymaria_
elastic; entire body
flexible; conical "head"

c. Mouth terminal; "neck" highly Genus *_Trachelocerca_
elastic; entire body
flexible; "head" square

d. Mouth terminal; "neck" highly Genus _Lagynus_
elastic; no separate
mouth-bearing portion

6. a. Body asymmetrical; bristles Genus _Stephanopogon_
in addition to cilia

b. Body symmetrical; 4 small Genus *_Mesodinium_
tentacles from mouth; cilia
and cirri in girdles

7. Shell composed of small Genus *_Tiarina_
sculptured pieces; cilia long,
uniform

* Presence at Woods Hole indicated by asterisk.

Genus LACRYMARIA Ehr. '30.

(Ehrenberg, C. G., 1838; Perty '52; Claparede & Lachmann '58; Stein
59-83; Quennerstedt '66, '67; Fromentel '74; Kent '81; Gruber '84;
Gourret & Roeser '86; Buetschli '88; Schewiakoff '89.)

Body short to very long flask-shape; for the most part contractile,
especially in the neck region. The posterior end is rounded or
pointed. The main character is the mouth-bearing apex, which "sets
like a cork in the neck of the flask." One or more circles of long
cilia at the base of the mouth portion or upon it. The body is
spirally striped. Contractile vacuole terminal, with sometimes one
or two further forward. Macronucleus central, globular to elongate,
sometimes double. Food mainly bacteria. Fresh and salt water.

Lacrymaria lagenula Clap. & Lach. Fig. 28, a, b.

Synonym: _L. tenuicula_ Fromentel '74.

Body more or less flask-shape, two or three times as long as broad,
with conical apex, which is slightly elastic and protrusible; surface
obliquely striate, with well-defined lines, 14 to 16 in number; cilia
uniform on the body, with a crown of longer ones at the base of the
conical proboscis. The body cilia are not thickly