The Wizard of the Sea, or A Trip Under the Ocean, by Roy Rockwood. New York, A. L. Burt Company. ©1900.
Part of the Great Marvels series, this book has an interesting lineage.
The cover on my version doesn’t look like the one posted at Violet Books — it’s a hunting-in-the-woods scene, with dogs, and has nothing at all to do with the story.
Thanks to Emmy for post-processing this project.