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Pseudocorythion acutum (Wailes, 1927)

Diagnosis: Shell small, colorless, elliptical, slightly flattened dorso-ventrally; fundus terminating in a short spine, aperture large, circular, everted, opening ventrally; test formed of circular or sub-circular plates, arranged more or less regularly in diagonal rows; animal not observed.

Dimensions: Wailes (1927): Shell length 50—55 µm; breadth about 23 µm; thickness 20 µm; aperture 16 µm in diameter; spine 5 µm in length; plates of test 3 µm in diameter and 1.5 µm in thickness.

Ecology: Marine. On the sea-beach.

Geographical distribution: Camp Island, British Columbia, Canada.

Remarks: Although found on the sea shore, it is in all probability a freshwater or moss inhabiting species.