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Restoration of under side of a trilobite (Triarthrus becki), the trunk limbs bearing small triangular respiratory lobes or gills.—After Beecher.
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- Auteur
- A Text-book of Entomology
by Alpheus S. Packard
Published 1898
Available from gutenberg.org - Ajoutée le
- Jeudi 11 Mars 2021
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