Monas sp. Fig. 9.

An extremely small form (3µ) attached by a thread of protoplasm—perhaps a flagellum, to algæ. The body is ovoid and the main flagellum is about four times the length of the body. The contractile vacuole is posterior. Only one specimen was seen and upon this I shall not attempt to name the species.

Genus MONOSIGA Kent '81.

(Bütschli '86; Francé '97; Senn 1900.)

Small colorless forms of Choanoflagellida, always naked and solitary. The posterior end is attached directly to the substratum, or there is a short stalk not exceeding the body in length. Kent '81 distinguished nine species, but Bütschli questioned the accuracy of many of these, and in this he was followed by Francé '97, who recognized three species—Monosiga ovata, M. fusiformis, and M. augustata. Fresh and salt water.

Fig. 10.—
Monosiga ovata.
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Monosiga ovata S. Kent '81. Fig. 10.

Synonyms: M. brevipes S. K.; M. consociata S. K.; M. limnobia Stokes.