Abstract
Cryptodifflugia ogerculata. n. sp. is a small shelled rhlzopod differing from the type specie of the genus, C. ovlformls Penard, 1890, chiefly in its manner of encysting with a secreted operculum closing the aperture of the test. Locomotion is by means of finely lobose, hyaline pseudopodla. The transparent, rigid test, which shatters under pressure, was found to consist at least in part of polysaccharlde. Nuclear division is by typical mitosis, and simple cell division was the only method of reproduction observed. A definition of the genus Cryptodlfflugia consistent with penard''s descriptions and distinguishing it clearly from the genus Difflugtella is offered, and a provisional key to the genus is presented.

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