""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...