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Updated: May 5, 2025
It is known from its position as the pygidium; and from the extreme sensitiveness of the hairs to the slightest aerial movement, may be a tactile organ warning of the approach of enemies; the eyes have no power to see. But we have not reached the ultimate accessible structure of this organ.
If we place a portion of the surface under one of the finest of our most powerful lenses, this will be the result. Now, without discussing the real optical or anatomical value of this result as it stands, what I desire to remind you of is: 1. The natural size of the flea. The increase of knowledge gained by its general enlargement. The relation in size between the flea and its pygidium.
M. Barrande pointed out that these primordial trilobites have a peculiar facies of their own dependent on the multiplication of their thoracic segments and the diminution of their caudal shield or pygidium.
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