Report on the Hydroida dredged by H. M. S. Challenger during the years 1873-76 This book, "Report on the Hydroida dredged by H. M. S. Challenger during the years 1873-76", by George James Allman, is a replication of a book originally published before 1883. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.