On the Stagonolepis Robertsoni (Agassiz) of the Elgin Sandstones; and on the recently discovered Footmarks in the Sandstones of Cummingstone

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Abstract
Introduction: In establishing the genus Stagonolepis Prof. Agassiz remarks*—“I have founded this genus upon a slab on which the impression of many series of great rhomboidal scales, arranged in the same way as those of the Lepidosteidæ , is observable. The angular form of these impressions allows of no doubt that the fish whence they proceeded was a great ganoid similar to Megalichthys . The absence of the fins, of the head, and of the teeth, however, renders the exact determination of the family to which the fossil belongs impossible. I arrange it provisionally in the neighbourhood of the genus Glyptopomus to which it presents some analogy in the ornamentation of its scales.” Prof. Agassiz goes on to say, in a subsequent paragraph, that the fossil came from the Upper Old Red at Lossiemouth; that he had not himself seen the original, and that he was acquainted with it only through Mr. Robertson’s drawings. Stagonolepis has remained ranged among the fishes in all the works on Geology and Palæontology which have been published Since the appearance of the ‘Mononographie.’ Sir C. Lyell, however, informs me that some years ago, after perusing the memoir on Mystriosaurus by Dr. A. Wagner, to which I shall have occasion to refer by and by, his suspicions were roused as to the real affinities of this so-called fish ; and he even communicated to the late Mr. Hugh Miller his doubts (based on the strong resemblance which he perceived between the sculpture of the dermal plates of Stagonolepis

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