| Publication Type: | Journal Article |
| Year of Publication: | 1858 |
| Authors: | C. Darwin Alfred Russel Wallace |
| Journal: | Journal of the Proceedings of the Linnean Society: Zoology |
| Volume: | 3 |
| Issue: | 9 |
| Pagination: | 45-62 |
| Type of Article: | Author's offprint of the original |
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