ILLUSTRATIONS. IX 



21. (i) Mandible of Macrcrpoton iU-ani Moodie, from the Linton Coal Measures 136 



(2) Portion of the skull of Maorerpclon deani Moodir, possibly of the same individual as the mati.lr 



From the Linton Coal Measures , y, 



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



(4) An additional specimen of Cercariomorphus parvisquamis Cope, from the Linton C<.;il Measures . ijh 

 (.S) 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 



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 160 



(3) Amphibian phalanx from the Coal Measures near Breeze, Illinois, of an unknown species 160 



(4) Large rib of a stereospondylous stcgocephalan, 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 



23. (i) Ventral scutelte 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. (i) 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 1 72 



(3) Type specimen of Cercariomorphus parvisquamis Cope 172 



25. (i) 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. (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. 



T. Map of the Coal Measures in North America 9 



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 



8. Vertebra and Ribs of Coal Measures Amphibia 28 



9. Ventral Scutellae of Micrerpeton 3 



10. Horny Armor of Hylonomus 3 ' 



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



12. Devonian Footprint 



1 ,v Restoration of Micrerpeton 



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

 140. Skeleton of Mazonerpeton longicaudatum 



146. Skeleton of Mazonerpeton costatum 64 



15. A. Impression of Erierpeton branchialis 



B. Eumicrerpeton parvum 



C. Larger Specimen of EumicrtTpetoti parvum 



D. Skeleton of Erpetobrachium m;i/:om-nsi;; 



E. Rib of Mazonerpeton costatum 



150. Type Material of Sparodus 



16. Obverse of Cocytinus gyrinoidcs 



l6a. Nearly Complete Specimen of Cocytinus gyrinoidcs 



17. Pelion lyelli, supposed ancestral Salientian 



1 8. Skeletal Elements of Smilcrpeton aciedentatum 



