New Pteraspids from South Wales

Abstract

Recently a number of specimens of pteraspids have been collected from different localities in the Lower Old Red Sandstone of South Wales, and these have proved to belong to two forms hitherto undescribed and a third not previously recorded from Britain, thus bringing the number of British species up to nine. In two instances specimens have been collected before, but they were fragmentary and were determined and recorded as belonging to well-established forms. The identity of these fossils is of interest, since they are in each case the only completely determined organic remains in the beds in which they occur, and may therefore be expected to throw some light on tlieir age, about which there has been a degree of uncertainty; with regard to this point, we may note at once that the palæontological evidence is not altogether in accord with the stratigraphical, for in two of the localities the fossils seem to indicate a younger age for the beds than field-workers are willing to admit.