The work described in this paper is a contribution to the general problems of rearing the larvae, and growing the spat of the European flat oyster, Ostrea edulis L.The specific aspect of the problem dealt with in detail is the place taken by minute motile organisms (naked dinoflagellates and other unicellular algae) in the food requirements of the developing veliger larvae.Six such flagellate organisms, ranging in size from 1·5 to 7 μ in diameter, have been isolated from sea water, and are maintained in pure culture, under conditions described. Pending specific identification, these are denoted by letter-labels only. These organisms have been used, over a period of years, in feeding experiments with oyster larvae.

When, in 1935, Dr Grahame Clark rediscovered the unpublished finds from a site at Glencrutchery, near Douglas in the Isle of Man, he at once realised that he had come upon the relics of a culture that was new to British archaeology. Its age and affinities were quite unknown, and in his most useful pioneer study (Clark, 1935, pp. 85–91) of the material, Dr Clark suggested that it should be assigned to a period which he called the ‘Ultimate Bronze Age’ of the Island, perhaps contemporary with the Iron Age in Britain.Investigation of material from other Manx sites subsequently made a much earlier dating seem likely, and this impression was confirmed in 1943 by the discovery of a richly-furnished dwelling site at Ronaldsway. Thanks to this chance discovery it is now apparent that we have to deal with a new facet of Neolithic civilisation in these Islands. So far it is known to us only in the Isle of Man.

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A survey of the sandy beach at Port Erin, Isle of Man, was made in. September, 1931. Observations were made, at a number of stations, involving simultaneous records of the macro-fauna and its density, and certain physical and chemical factors of the sand and interstitial water, as well as tidal level on the beach. The results enable certain general conclusions to be drawn as to the causes of the observed distribution of species, and of the differences between the faunas of this and some Scottish beaches. Plans are given, indicating tidal contours, salinity, and grade composition, in situ on the beach, together with frequency diagrams for five dominant species.