""A Revision of the Genera and Great Groups of the Echinoidea"" is a scientific book authored by Peter Martin Duncan and published in 1889. The book is a comprehensive study of the classification of the Echinoidea, a class of marine animals commonly known as sea urchins. Duncan provides a detailed analysis of the morphology, anatomy, and systematics of the Echinoidea, including their skeletal structures, reproductive organs, and ecological roles. The book also includes a thorough revision of the classification of the Echinoidea, with a focus on the genera and major groups of these organisms. The book is an important reference for scholars and researchers in the field of marine biology and zoology, and it remains a classic work in the study of echinoderms.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.