Twenty-six species of podocopid ostracods are present in a high Antarctic fauna obtained from Halley Bay. Diagnoses are given of the two new genera Antarcticythere and Myrena, and the new species Cativella bensoni, Loxocythere frigida and Robertsonites antarcticus are described. Comparisons are made with other faunas described from the Antarctic.
As in other high Antarctic faunas, the species Antarcticythere laevior, Myrena meridionalis, Cytheropteron gaussi, Xestoleberis rigusa, Cativella bensoni, Robertsonites antarcticus and Australicythere
polylyca are characteristic species. In Pseudocythere caudata, and southern forms which cannot be satisfactorily differentiated from this species, size is shown to increase with latitude. It is suggested that the distribution of this fauna is controlled by temperature in conjunction with the East Wind Drift, the Antarctic Peninsula and the Scotia Ridge preventing its spread towards South America.