The 'anchor-dredge' is a lightly built one-sided instrument designed to catch deep-burrowing animals. The depth to which it digs is dependent on the pull of the warp and not on the weight of the dredge.From a trawler, it is best to work the dredge from the forward gallows, and give it a 'tug' as the ship is moving astern.Comparative tests and direct underwater observations have shown that the anchor-dredge samples the in-fauna more efficiently than do either large rectangular and oval dredges, or the conical dredge.A description and plan is given of a larger model, designed for use from a 6o-ft. or 90-ft. ship.