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The desert on both sides of the Nile is inhabited by a land-snail of which I have counted eighty, in estimation, on a single shrub barely a foot high and thousands of its shells are swept along and finally buried in the drifts by every wind. Every handful of the sand contains fragments of them.
The same may be said of the only two species of land-snail which have been found connected with the coal forests, viz., pupa vetusta and zonites priscus, both discovered in the cliffs of Nova Scotia. These are sufficient to demonstrate that the fauna of the period had already reached a high stage of development.
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