This book, "A lower Cambrian edrioasterid, Stromatocystites walcotti with one plate. 3", by Charles Schuchert, is a replication of a book originally published before 1919. 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.