characters of both upper and lower molars of this small Iguanodon, no one in quest of the truth of the matter could affirm "that the teeth of this reptile were perfectly distinct from those of Iguanodon Mantelli." In the last plate of Prof. Owen's 'Monograph' for the forthcoming volume of the Palæontographical Society, the mandible and mandibular teeth are figured; and he had hoped to receive a proof to show to the Meeting. The mandibular teeth exhibited by Mr. Hulke were identical with those previously discovered by Mr. Fox. In the 'Monograph' the evidence will be found of the specific, but not generic, distinction of Mr. Fox's small Dinosaur from the large Iguanodon Mantelli.
First Paper.
I. Introduction.
The detailed observations of the Geological Survey having led my colleagues and myself to conclude that the great mer de glace which enveloped the south of Scotland during the intensest cold of the Glacial Epoch was so extensive as entirely to fill up the basin of the Clyde, and all the sea between Ailsa Craig and the mainland, I became curious to ascertain what the islands of the Outer Hebrides had to tell us in regard to the extension of the old ice-sheet in that direction. My brother had in 1865 shown that the island of Bute was glaciated from end to end by the ice that streamed outwards from the mountain-glens of Argyllshire; and subsequent observations by myself in Ayrshire had proved that the rocky coasts between Lendalfoot and Glen App were striated in a direction parallel to the shore-line by glacier masses which flowed south-west upon what is now the bed of the sea. My colleague, Mr. D. R. Irvine, had also found that ice from the southern uplands had swept across the Rinns of Galloway from the interior of the country—the whole coast between Portpatrick and Corsill Point exhibiting numerous rock-striations and glaciated surfaces, whose prevailing direction is towards south-west. Thus it would appear that an immense mass of glacier ice, derived partly from the Highlands and partly from the Southern Uplands, set towards the north coast of Ireland. Moreover the position of the striæ and the whole character of the glaciation of that south-west part of Scotland induces the belief that the Scottish mer de glace became confluent with that of Ireland, splitting upon the northern coasts of Galway and flowing south into what is now the Irish Sea, and west into the Atlantic. But to what extent that ice-sheet stretched seaward, it would be premature at present to offer even a conjecture. That we shall yet be able to form some approximately true estimate of the depth and breadth of the mer de glace can hardly be doubted. Towards this end, it obviously becomes important to trace the direction of
