A study of the ecology of lower Devonian brachiopods and bivalve molluscs collected from the flat-lying sedimentary rocks of the Horlick formation, Ohio range, Antarctica, shows that the three most common species Nuculoidea musculosa, Nuculites africanus and Modiomorpha baini are deposit-feeding infaunal forms which fed on organic detritus within the sediment. The epifaunal genus Prothyris is a suspension-feeding form which probably lived attached to hard-surfaced objects by means of byssal threads. The bivalve assemblage suggests that in the lower Devonian Antarctica was a region of relatively cool temperatures with a cool, shallow, normally saline depositional environment.

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