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The grandson of John Graham was Sir William Graham of Claverhouse, the chosen friend of his cousin, the gallant and unfortunate Marquis of Montrose. By his wife Marion, daughter of Thomas Fotheringham of Powrie, Sir William had two sons, George and Walter, of whom the latter was the ancestor of those Grahams of Duntroon who at a later period assumed the title of Dundee.
Powrie enumerates no less than five genera of the family Acanthodidae, the spines, scales, and other remains of which have been detected in the grey flaggy sandstones. Pterygotus anglicus, Agassiz. Pterygotus anglicus, Agassiz. Forfarshire. Ventral aspect. Restored by H. Wodward, F.G.S. a. Carapace, showing the large sessile eyes at the anterior angles. b.
Powrie to be the eggs of crustaceans, which is highly probable, for they have not only been found with Pterygotus anglicus in Forfarshire and Perthshire, but also in the Upper Silurian strata of England, in which species of the same genus, Pterygotus, occur.
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