23- 



24. 



25- 



26. 



ILLUSTRATIONS. IX 



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



2) Portion of the skull of Macrerpeton deani Moodie, possibly of the same individual as the mandible. 

 From the Linton Coal Measures 1 36 



3) Type of Cercariomorphus parvisquamis Cope, from the Linton Coal Measures 136 



4) An additional specimen of Cercariomorphus parvisquamis Cope, from the Linton Coal Measures. ... 136 



5) Skull of Sauropleura scutellata Newberry. 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 



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 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 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 160 



i) Ventral scutellae 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 



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 



i) Photograph of type specimen of Erpetosaurus (Tuditanus) radiatus Cope, from the Coal Measures 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 iSo 



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 



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 



8. Vertebrae and Ribs of Coal Measures Amphibia 28 



9. Ventral Scutellae of Micrerpeton 30 



10. Homy Armor of Hylonomus 31 



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



12. Devonian Footprint 37 



13. Restoration of Micrerpeton. 53 



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



140. Skeleton of Mazonerpeton longicaudatum 62 



146. Skeleton of Mazonerpeton costatum 64 



1 5. A. Impression of Erierpeton branchialis 65 



. B. Eumicrerpeton parvum 65 



C. Larger Specimen of Eumicrerpeton parvum 65 



D. Skeleton of Erpetobrachium mazonensis 65 



E. Rib of Mazonerpeton costatum 65 



15a. Type Material of Sparodus 66 



16. Obverse of Cocytinus gyrinoides 68 



16a. Nearly Complete Specimen of Cocytinus gyrinoides 69 



17. Pelion lyelli, supjwsed ancestral Salientian 74 



18. Skeletal Elements of Smilerpeton aciedentatum 82 



