THE AMERICAN NATURALIST, An Allustrated Magazine OF NATURAL HISTORY. EDITED BY EDWARD D. COPE AND J. S. KINGSLEY, ASSISTED BY DR. C. O. WHITMAN, DR. C. E. BESSEY, THOMAS WILSON, PROF. C. M. VOLUME XXVIII. PHILADELPHIA, U. S. A. THE EDWARDS & DOCKER CO., 518 AND 520 MINOR STREET. 1894. LEADING ARTICLES: Criticism of some Cases of Apparent Transmission of Mutilations. Dr. O. von Certain Shell Heaps of the St. John's River, Florida, hitherto unexplored (Il- Perigonimus jonesii; A Hydroid supposed to be new, from Cold Spring Har- bor, Long Island (Illustrated). HENRY L. OSBORN and C. W. HAR- The Energy of Evolution. E. D. COPE........ On a Small Collection of Vertebrate Fossils from the Loup Fork Beds of Northwestern Nebraska, with Note on the Geology of the Region (Il- Remarks on Schulze's System of Descriptive Terms. A. HYATT....... |