ILLUSTRATIONS. 



PLATES. 



Pace.- 



I. Views along Mazon Creek, Illinuiii 12 



a. Drawing of type specimcm of Micrerpeton caudutuni Mtxxlie, from the Coal Measures of Maz<jn Creek. . 52 



3. Specimens of Eumicrerpeton parvum, Erjietobrachium mazonensis, Ericrpeton branchialis, Mazonerpeton 



longicautlatum, and Amphil)amus grandiceps 58 



4. (1 and 2) VertcbrsE of Spondylerpeton spinatum Moodio. (.^) Type specimen of Mazonerpeton costatum 



Moodie. (4) Tyi>e skeleton of Ccphalerpeton vcntriarmatum Moodie. (5 and 6) The halves of the 



nodule containing a practically complete skeleton of Amphibamus grandiceps Cope 60 



5. (1) A reconstruction of the Coal Measures branchiosaurian, Eumicrerpeton parvum Moodie, a small 



primitive salamander 64 



(3) A restoration of the branchiosaurian, Mazonerpeton, based on two specimens 64 



6. Dendrerpcton acadianum Owen. Mandibles, parts of anterior extremities, humerus, etc 68 



7. Hylerpeton dawsoni Owen. Mandible, teeth, rib, and bones of anterior extremity. Bones of pelvis and 



posterior limb and bony scales 72 



8. Fritschia curtidentata Dawson. Bones of skull and anterior extremity, bony rods of belly, of pelvis, and 



posterior extremity 76 



9. Hylonomus lyelli Dawson, (i) maxills and skull bones; (la) sternal bones; (2) mandible; (3) humerus, 



ribs, and vertebrae; (4) posterior limb; (5) pelvis; (6) caudal vertebrae 78 



10. Hylonomus latidens Dawson. Skull, portion of skeleton, foot, scapular, and sternal bones, humerus and 



rib, believed to belong to this species. Erect tree. Coal formation, of Nova Scotia 80 



11. Hylerpeton longidentatum Dawson. Mandible and other bones. Erect tree, Coal formation 82 



12. Smilerpeton aciedentatum Dawson. Mandible, ix>rtions of skull, scales, and various Ijones. Erect tree. 



Coal formation 82 



13. Dendrerpeton oweni Dawson. Skull, mandible, and bones of anterior limbs, posterior limb, pelvis, and 



bony scales 100 



14. (1 and 2) Amphibamus grandiceps Cope, from the Mazon Creek shales 106 



(3) Sauropleura (Colosteus) scutellata Newljerry, from the Linton Coal Measures, the first known of the 



Ohio Coal Measures Amphibia; at first ascribed by Newberry to the fishes, but later correctly identi- 

 fied by Cope 106 



(4) Type of Diceratosaurus (Ccratcrpeton) punclolincatus Cf>i>c, from the Linton Coal Measures 106 



15. (l) Dorsum of skull of Diceratosaurus punclolincatus (Cope), from the Coal MeasurcHof Linton, Ohio. . 1 14 



(2) Ventral surface of skull of Diceratosaurus punclolincatus (Coix;), from the Coal Measures of Linton . . 114 



(3) Pectoral girdle of Diceratosaurus punctolinealus (Cope), from the Coal Measures of Linton 114 



(4) Cervical or anterior dorsal vertebra of Diceratosaurus punctolinealus (Cope), from the Linton Coal 

 Mea-sures 114 



16. (l) Type specimen of Diceratosaurus punctolinealus Cope n6 



(2) Skull of Sauropleura longidentata Moodie, from the Coal Measures of Linton, {»hio . 116 



(3) Mandible of Sauropleura longidentata Mcxxlie, from the Coal Measures of Linton, Ohio 1 16 



(4) Type sjx-cimen of Sauropleura enchodus Co]x;, from the Coal Measures of Linton, Ohio i 16 



(5) Additional specimen of Diceratosaurus punctolinealus Cope, from the Coal Measures of Linton. Ohio. 1 16 



17. Type of Saurerpeton lathithorax Cope 126 



18. (i) Type of Erpetosaurus sculptilis Moodie, from the Cannellon Shales of Pennsylvania 132 



(2) Skeletal elemc-nts of Eryops sp. indet., from the Pittsburgh Red Shale at Pitcairn 132 



(3) Amphibian footprints, Dromopus aduncus Branson, from the Mississippian shales of Giles County, 

 Virginia 1 32 



(4) Type of Thinopus anti(|uus Marsh, amphibian footprint from the Devonian of Pennsylvania 132 



19. Type of Ctenerpeton alveolatum Cojje, from the Coal Measures of Ohio 134 



30. (l ) Skull of Erpetosaurus minutus Moodie, from the Cannelton slates of Pennsylvania 134 



(2) Skull and anterior part of body ofPtyonius pecliiiatus Cope, from the Coal Measures of Linton 134 



(3) Skelet<jn of Eosauravus copei Williston, from the C<jal Measures of Linton. " The oldest known reptile 



from North America" and closely related structurally to the Microsauria 134 



(4) Part of ventral scutellation and ribs of Sauropleura digitala Cope, from the Coal Measures of Linton . 134 



viii 



