About 40 years ago I went to a country house sale and purchased what was catalogued as a "Cabinet of Curiosities" Mainly shells and coral but with some very fine British mineral specimens which I wanted and a few fossils. The real prize was two 6ft. + narwal tusks which still hold pride of place on my study wall. Most of the fossils were easy to identify however there was the upper and lower jaw of what is clearly from the teeth a carniverous animal which is relatively primative as the teeth are undiferentiated. The specimen has been sectioned and polished on two faces (not my work). It came to light recently when I was emptying a crate in my callar and it got me wondering what my little friend really was.