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been separated and removed : sufficient, however, of the animal 
here exists, to show that it is comparable with no known animal. 
Plate XVII. Fig. 15, is the representation of the upper part of 
an extraordinary fossil ; but with where it was found I am totally 
unacquainted. Its matrix is a ferruginous lime-stone, in which are 
discoverable particles of pyrites. It appears to be the dorsal plate of 
some enormous insect. On this plate regular transverse markings 
are observable, none of which are to be seen on the abdominal plate. 
It may, perhaps, be the remains of some huge insect of the genus 
Oniscus, or rather Monoculus ; but it differs so much from any known 
animal, as to render guessing at even its genus presumptuous. 
