ILLUSTRATIONS. IX 



21. (i) Mandible of Macrerpeton deani Moodie, from the Linton Coal Measures 136 



(2) Port inn of the skull of Marrcrpcton deani Moodie, possibly of the same: individual us the mandible. 



From the Linton Coal Measures i ,V< 



13) Type of Cercariomorphus parvisquamis Cope, from the Linton Coal Measures. . t3h 



(4) An additional specimen of Cercariomorphus parvisquamis Cope, from Hi. Linton ( 'o;il \l< .1 lure 130 



(5) Skull of Sauropleura scutellata Ncwberry. From the Coal Measures of Ohio 136 



(6) Tooth of Mastodonsaurus sp. indet. of the Carboniferous of Kansas 136 



(7) Tooth of Mastodonsaurus giganteus Jaeger, from the Triassic of Germany. Introduced for compar- 

 ison with the tooth from the Kansas Carboniferous 136 



22. (i) 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 1 60 



(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 sculp- 

 turing 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 1 60 



23. (i) Ventral scutells of Ctenerpeton alveolatum Cope, from the Coal Measures of Ohio 1 66 



(2) Left leg and pelvis of Ichthycanthus platypus Cope, from the Coal Measures of Ohio . . 1 6rt 



24. (i) Type specimen of Pelion lyelli Wymati, 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. (i) Photograph of type specimen of Erpetosaurus (Tuditanus) radiatus Cope, from the Coal Mc.-isures ot 



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. (i) 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. . <} 



2. Distribution of Coal Measures Amphibia in North America, . 1 1 



3. Topographical Map of Mazon Creek Region. . . 13 



4. Topographical Map of Linton, Ohio, Region. . 16 



5. Fossil Tree Trunk in Position ... 21 



6. Generalized Amphibian Skull 23 



7. Alimentary Canal of a Carboniferous Salamander 26 



S. Vertebrae and Ribs of Coal Measures Amphibia . . 28 



<;. Ventral Scutellse of Micrerpeton 30 



10. Horny Armor of Hylonomus 31 



11. The Skulls of two Microsaurians: A. Eoserpeton tenuicorne; B, Ceraterpeton galvani. . 33 



12. Devonian Footprint 37 



13. Restoration of Micrerpeton .S3 



14. Mazon Creek Amphibia: A, Eumicrerpeton parvum; B, Amphibamus thoracatus. 59 

 140. Skeleton of Mazonerpeton longicaudatum . . 62 

 146. Skeleton of Mazonerpeton costatum 64 



15. A. Impression of Erierpeton branchialis 65 



B. Eumicrerpeton parvum 65 



C. Larger Specimen of Eumicrerpeton parvum. 65 



D. Skeleton of Erpetobrachium m.-izonensis . d.S 



E. Rib of Mazonerpeton costatum. . . d.S 

 15<z. Type Material of Sparodus 66 



16. Obverse of Cocytinus gyrinoides 68 



160. Nearly Complete Specimen of Cocytinus gyrinoides. . . . 69 



17. Pelion lyelli, supposed ancestral Salientian 74 



1 8. Skeletal Elements of Smilcrpeton aciedentatum 82 



