Mrs. Longmuir had furnished me with a note of introduction to Dr. Emslie of Banff, an intelligent geologist, familiar with the deposits of the district; and, walking on to his place of residence next morning, in a rain as heavy as that of the previous night, I made it my first business to wait on him, and deliver the note. Ere, however, crossing the Deveron, which flows between Banff and Macduff, I paused for a few minutes in the rain, to mark the peculiar appearance presented by the beach where the river disembogues into the frith. Occurring as a rectangular spit in the line of the shore, with the expanded stream widening into an estuary on its upper side, and the open sea on the lower, it marks the scene of an obstinate contest between antagonist forces,--the powerful sweep of the torrent, and the not less powerful waves of the stormy north-east; and exists, in consequence, as a long gravelly prism, which presents as steep an angle of descent to the waves on the one side as to the current on the other. It is a true river bar, beaten in from its proper place in the sea by the violence of the surf, and fairly stranded. Dr. Emslie obligingly submitted to my inspection his set of Gamrie fossils, containing several good specimens of Pterichthys and Coccosteus, undistinguishable, like those I had seen on the previous day, in their state of keeping, and the character of the nodular matrices in which they lie, from my old acquaintance the Cephalaspians of Cromarty. The animal matter which the bony plates and scales originally contained has been converted, in both the Gamrie and Cromarty ichthyolites, into a jet-black bitumen; and in both, the inclosing nodules consist of a smoke-colored argillaceous limestone, which formed around the organisms in a bed of stratified clay, and at once exhibits, in consequence, the rectilinear lines of the stratification, mechanical in their origin, and the radiating ones of the sub-crystalline concretion, purely a trick of the chemistry of the deposit. A Pterichthys in Dr. Emslie's collection struck me as different in its proportions from any I had previously seen, though, from its state of rather imperfect preservation, I hesitated to pronounce absolutely upon the fact. I cannot now doubt, however, that it belonged to a species not figured nor described at the time; but which, under the name of _Pterichthys quadratus_, forms in part the subject of a still unpublished memoir, in which Sir Philip Egerton, our first British authority on fossil fish, has done me the honor to associate my humble name with his own; and which will have the effect of reducing to the ranks of the Pterichthyan genus the supposed genera _Pamphractus_ and _Homothorax_. A second set of fossils, which Dr. Emslie had derived from his tile-works at Blackpots, proved, I found, identical with those of the Eathie Lias. As this Banffshire deposit had formed a subject of considerable discussion and difference among geologists, I was curious