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SUMMARY

In the course of the International Indian Ocean Expedition two storm-petrels, thought to be Oceanodroma matsudairae and O. monorhis, were encountered in the western Indian Ocean in some numbers. Two specimens of each species were collected, monorhis in the Arabian Sea, matsudairae off N.W. Australia. O. matsudairae, which had not been recorded before from these waters, appeafed to be concentrated within 5° of the equator and the birds probably belonged to the spring-breeding population of Volcano Island. O. monorhis was found mostly in the Arabian Sea.

Bulweria bulwerii, for which there was but one certain Indian Ocean record, was also encountered several times.