Cybium sp. tooth in jaw fragment collected from the Eocene Bracklesham Beds in Lee on Solent, Hampshire. Cybium is a genus of the Mackerel family of fish. The Bracklesham beds in which this jaw fragment was found are well known among paleontologists and fossil collectors in Britain; they have yielded over 160 different species of fish and the beds continue to be productive today despite having been pillaged by collectors for over 100 years. The jaw fragment measures 27 mm in length and is supplied in a small plastic bag with an information label.