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. The contractile vacuole is in the anterior
neck-like portion of the body. The flagellum is inserted in a
distinct oesophageal tube, into which the contractile vacuole
empties. This tube is continued into a deeper pharyngeal apparatus of
unknown function.