XXXIX.—<i>Descriptions of new and imperfectly-defined species of Jurassic Nautili contained in the British Museum (Natural History)</i>

Abstract

In studying-the Jurassic Nautili in the British Museum it became evident to us that many of the species required revision, Sowerby's names especially having been used by authors indiscriminately for forms which, on investigation, were found to disagree materially with the types.It has been our endeavour, with the aid of the excellent material furnished by the National Collection (which contains many of Sowerby's types), to give such definitions and figures of the species as may conduce to their correct identification by future workers.We have found it necessary to create some new species, which have been derived chiefly from the rich Jurassic fauna of Dorset and Somerset.Two species are included from the Lias of France ;