Special Papers in Palaeontology , published by The Palaeontological Association, is a series of substantial separate works conforming to the style of The Palaeontology Journal . Two issues are published each year and feature high standard illustrations. It investigates the thelodonts and putative chondrichthyans from rocks of upper Llandovery (Lower Silurian) to Lochkovian (Lower Devonian), from Baillie-Hamilton and Cornwallis islands, Arctic Canada. It presents new anatomical information which will allow greater precision in future phylogenetic studies of thelodonts and related vertebrates. It brings together researchers, geologists and enthusiasts who continue to find material of significance. It includes 29 plates and 71 text-figures.