Anomotodon sheppeyensis
Goblin Shark
Early Eocene
London Clay
near Warden Point, Isle of Sheppey, England.

Excellent 0.6 inch fossil Goblin Shark tooth.

Anomotodon is an extinct genus of goblin shark which has been reported from numerous Late Cretaceous localities worldwide.  It survived the K/T extinction event but became rare by the Oligocene, perhaps surviving into the Miocene.

Just one genus of goblin shark, Mitsukurina, still lives today.

Wikipedia has an extensive article on goblin sharks.