^{page 261 note 1} In justice to ourselves we ought to say that our investigations in the horizontal Crag were begun long before our attention was called to Mr. Wood's map, or paper. Should the physical and palæontological evidence concur, as we believe it will, the question as to the superposition of the Upper Crag over the Lower will besettled, and it will then be necessary to show the agreement in the fauna of all the deposits which we have comprised under the heading Upper Crag. This must, however, be left till a future opportunity. A slight indication how matters stand in this direction is all that we now propose giving.