In the following brief remarks on the range and distribution of Brachiopoda in British strata, and in the accompanying tables, the classification of Dr. Davidson has been mainly followed; and the calcuations of the numbers have been prinicipally based on the researches of that great authority, though the recent discoveries of Mr. C. Moore and others have been duly taken into consideration. These numbers must, of course, only be regarded as showing the present state of knowledge on the subject, as the active search which many observers are making will doubtless materially alter the figures here given.