The Cornish Grey Seal colonies have remained static in contrast to a general increase in numbers elsewhere in Britain. At Scilly, almost continuous human interference is thought to have been either directly or indirectly responsible for this. The seals breed on exposed rocky islets in the west of the archipelago and the total population is thought to be about fifty. Short notes are given on breeding behaviour and a short term marking technique for seal calves is explained. A comment is made on the general nature of seasonal movements in the species.