Studies in evolution; mainly reprints of occasional papers selected from the publications of the Laboratory of invertebrate paleontology, Peabody Museum, Yale University. By Charles Emerson Beecher
I. General evolution. The origin and significance of spines.--II. Structure and development of trilobites.--III. Studies in the development of the Brachiopoda.--IV. Miscellaneous studies in development: 1. Development of a paleozoic poriferous coral. 2. Symmetrical cell development in the Favositidae. 3. Development of the shell in the genus Tornoceras Hyatt.--Plates