22. (1) Type of Leptophractus lineolatus Cope, from the Coal Measures of Linton. Portions of maxilla and mandible of left side with teeth 160 (2) Type of Proterpeton gurleyi Moodie, from the Coal Measures of Illinois, near Danville. Cervical of an otherwise unknown amphibian 160 (3) Amphibian phalanx from the Coal Measures near Breeze, Illinois, of an unknown species 160 (4) Large rib of a stereospondylous stegocephalan, otherwise unknown 160 (5) Type of Cope's species Tuditanus mordax referred by him to the cranium, on account of the sculpturing of the elements, now known to be portions of the interclavicle and clavicles of Diceratosaurus punctolineatus 160 (6) Skull of Baphetes planiceps Owen, from the Coal Measures of Nova Scotia 160 23. (1) Ventral scutellæ of Ctenerpeton alveolatum Cope, from the Coal Measures of Ohio 166 (2) Left leg and pelvis of Ichthycanthus platypus Cope, from the Coal Measures of Ohio 166 24. (1) Type specimen of Pelion lyelli Wyman, from the Coal Measures of Ohio. Supposed to represent the ancestral form of the Salientia 172 (2) Scales of Cercariomorphus parvisquamis Cope, a microsaur from the Ohio Coal Measures 172 (3) Type specimen of Cercariomorphus parvisquamis Cope 172 25. (1) Photograph of type specimen of Erpetosaurus (Tuditanus) radiatus Cope, from the Coal Measures of Linton 180 (2) Photograph of type specimen of Erpetosaurus tabulatus Cope, from the Coal Measures of Linton 180 (3) Photograph of the impression of Stegops divaricata Cope, from the Coal Measures of Linton 180 (4) Type and only known specimen of Micrerpeton caudatum Moodie, a branchiosaur from the Coal Measures shales of Mazon Creek 180 26. (1) Type specimen of Erpetosaurus tuberculatus Moodie, from the Ohio Coal Measures 182 (2) Type of Macrerpeton huxleyi Cope, from the Coal Measures of Ohio 182 TEXT-FIGURES. 1. Map of the Coal Measures in North America 9 2. Distribution of Coal Measures Amphibia in North America 11 3. Topographical Map of Mazon Creek Region 13