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Книга по требованию: Memoirs of the Geological Survey of the United Kingdom

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Figures and Descriptions; Illustrative of British Organic Remains; Monograph I (Classic Reprint)

Вес: 0.2 кг.
Год издания: 2015
Страниц: 118 Переплет: мягкая обложка
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Excerpt from Memoirs of the Geological Survey of the United Kingdom: Figures and Descriptions; Illustrative of British Organic Remains; Monograph I

The genus Pterygotus was established by Professor Agassiz, in the following note appended to page xix. of his well-known work, the "Monographie des Poissons Fossiles du Vieux Gres Rouge" (1844): -

"The Plate A, accompanying this monograph, represents many well preserved fragments of one of those gigantic Crustacea of the Old Red, collected by Mr. Webster in the neighbourhood of Balruddery, in Scotland. Deceived by the scaly aspect of a portion of the carapace, I at first believed that this might be the type of a peculiar genus of fishes, and to that class I referred Pterygotus, in my enumeration of the fossil fishes of the Silurian system, published in Murchison's great work. This genus, founded upon very imperfect fragments from the Ludlow rocks, is now well known, from the investigations which I have been enabled to make of a new species from the Old Red, discovered by Lyell, in Forfarshire, and of which Mr. Webster has found more characteristic remains at Balruddery. The specimens collected by Lyell are those large scutes, of which I have spoken in my 'Recherches' vol. i. p. 26, and which, in the absence of the means of rigorous determination, have been seriously taken for the remains of superhuman beings.

"Dr. Buckland and I, on examining them carefully, convinced ourselves that they must be the carapaces of Crustacea; but it was only in 1840 that I obtained direct proof that such was the case. In fact, among the specimens collected and communicated to me at that time by Mr. Webster, are fragments of carapaces, segments of the tail, the natatory palettes with which the extremity of the latter was provided, legs, and chelae. These remains remove all doubt as to the zoological position of the fossil. It is a crustacean of colossal size, having a carapace of more than a foot and a half in width, and a tail about a foot wide.

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