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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.
- Author
- A Text-book of Entomology
by Alpheus S. Packard
Published 1898
Available from gutenberg.org - Posted on
- Thursday 11 March 2021
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- 610*982
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