The Blackband Ironstone, at present extensively wrought at Borough Lee, Dryden Vale, about 5½ miles to the south-east of Edinburgh, is a member of the Middle Division of the Carboniferous Limestone Series. It abounds in fish remains, most of them unfortunately in a fragmentary and scattered condition, nevertheless many of these are clearly new to science. Such of these new forms as are most distinctly marked I propose to notice in the present communication ; the list will, however, doubtless be considerably extended by additional patient research, and we may also hope, that some further light will be thrown on the fishes, to which some of these fragments belonged.