| Key | Title |
| 1533 | Key to the genera of Polypteridae of West Africa. |
| 1536 | Key to the species of Polypterus of West Africa. |
| 1582 | Key to the species of Polypterus of Lower Guinea, West-Central Africa. |
| 1584 | Key to the genera of Polypteridae of Lower Guinea, West-Central Africa. |