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Stagonolepis robertsoni Agassiz

Calotype web 
This unusual image (LDGSL/615-folio 4, sheet 43) is not a drawing but a calotype. A calotype or 'photogenic drawing' was one of the earliest photographic processes, invented by Henry Fox Talbot around 1838-1839. The image, produced between 1844-1845 probably by the noted Scottish photographers David Octavius Hill and Robert Adamson, has since badly faded, and has at some point been touched up with sepia ink or watercolour.   

The specimen shown in the image was found in August 1844 in the spoil heap of a quarry in Lossiemouth, Morayshire. It is not a fish but a crocodile-like reptile with armoured bony plates - Stagonolepis robertsoni Agassiz.