spiral course, passing even twice around the body. The flagella
arise near cross-furrow or, in some cases, in longitudinal furrow.
Chromatophores may or may not be present and food-taking is holozoic,
in many cases at least. In some cases ectoplasm and endoplasm can be
distinguished. Fresh and salt water.


Gymnodinium gracile Bergh '82, var. sphærica, n. Fig. 20.

The body is divided by the transverse furrow into a shorter anterior
and a longer posterior part. The longitudinal furrow is broader at
the posterior extremity than at the cross-furrow. The structural
feature upon which this new variety is made is the unvarying
plumpness of the body, making it almost spherical, except for
a slight flattening dorso-ventrally. The nucleus is large and
ellipsoidal, with characteristic longitudinal markings of chromatin.
The endoplasm is evenly granular, with a number of large ingested
food bodies. The color is brown, not rose-red as in Bergh's species,
nor is the Woods Hole form as large as the latter. Length of body
68µ; width 55µ. Common.


[Illustration: Fig. 20.--_Gymnodinium gracile_, var. _sphærica_.]


Genus GLENODINIUM (Ehr.), Stein '83.

(Bergh '82; Bütschli '86; Pouchet '85; Daday '86.)

Small globular forms with two distinct furrows, one transverse around