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Updated: May 7, 2025
Pteropods, a suborder of the gastropods, appeared in this age. Their papery shells of carbonate of lime are found in great numbers from this time on. The Orthoceras had a long, straight, and tapering shell, divided by cross partitions into chambers. The animal lived in the "body chamber" at the larger end, and walled off the other chambers from it in succession during the growth of the shell.
And so far as zoological science goes we must, at least, admit that such a creature is an evolutionary possibility. Their kindred, the Gastropods, have, in the case of the snail and slug, learnt the trick of air-breathing.
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