Several species of Vertebrata are now known to be common to the Upper Lias of the neighbourhood of Whitby, Yorkshire, and the corresponding formation so widely developed in parts of Würtemberg and Bavaria. The recent discovery of another link between the two faunas in question thus seems to be worthy of placing on record. Moreover, the latest comparisons render it possible to assign to the fossil under consideration a more precise specific diagnosis than has hitherto been published; and the announcement of the discovery may lead to the recognition of other specimens besides those in the British Museum, with which alone as yet the present writer is acquainted.