Callorhynchus regulbiensis near complete lower tritor collected from the Palaeocene Woolwick Bottom Beds in Herne Bay, Kent, UK. Callorhynchus is a genus of chimaeroid fish. Today chimaeroid fish reside largely in deep waters and their closest living relative are sharks despite having branched off from sharks 400 Mya. Chimaeroid fish are cartilaginous, this usually means that their remains are limited to the harder parts of the organism such as the tritors (teeth), jaw plates and fin spines. These tritors are fragmented however they are near complete. Naturally their shape and size varies but most fragments measure between 15 and 20 mm in length. Supplied in a small plastic bag with an information label.