PLATE XIII. 



PAGE. 



ORTHOPLEURODUS NOVO MEXICANUS, St. J. & W 105 



Fig. 1 a. Maxillary posterior tooth, left ramus, view from above, outline partially 

 restored; 1 b. do., profile from the straight border. Lower Carbonif- 

 erous; Santa Fe. New Mexico. Messrs. Springer and St. John. 

 Fig. 2 a, 1). Similar views of the same form of right ramus. Same formation, locality 



and collection. 

 Fig. 3 a. Mandibular posterior tooth, left ramus, seen from above, outline restored; 



3 b, do., inner margin, transverse profile; 3 e, do., longitudinal profile 

 from the antero-lateral border. Same formation, locality and collection. 



OKTHOPLEUBODUS CONVEXUS, St. J. and W 193 



Fig. 4 a. Mandibular posterior tooth, right ramus, view from above, outline restored; 



4 b, do., longitudinal profile from antero-laterul border; 4 c, do., trans- 

 verse profile from inner margin. Strata above the Mahoning Sandstone 

 Coal-Measures; Morgantown, West Virginia. Prof. Worthen. 



Fig. 5 a. Maxillary posterior tooth, left ramus, view from above, restored in outline; 



5 b, do., profile from the straight border. Same formation, locality and 

 collection. 



OETHOPLEUEODUS CAKBONAEIUS, (N. and W. sp.) 192 



Fig. 6 a. Maxillary posterior tooth, left ramus, a small, well-preserved example, seen 



from above, outline partially restored. 

 Fig. 7 a. Mandibular posterior tooth, left ramus, a similarly preserved specimen, 



from above. 



Fig. 8 a. Mandibular median tooth, left ramus, view from above, outline partially 

 restored. Lower Coal-Measures, roof of Coal No. 5; Bloomington, Ills. 

 Mr. L. A. Fuller. 



NOTE: The three above specimens were associated on a bit of carbonaceous shale in 

 such a manner as to leave scarcely a doubt that they pertained to one and the 

 same individual. St. John. 



TENIODUS FACIATUS, CM. and W. sp.) 70 



Fig. 9 a. Maxillary posterior tooth, right ramus, view from above, restored in out 

 line; 9 b, do., transverse profile from inner margin; 9 c, do., outer in- 

 rolled margin; 9 d, do., from tne antero-lateral border; 9e, do., postero- 

 lateral border. Provisionally identified with the above species. Warsaw 

 limestone; above Alton, 111. Mr. Van Home. 



TENIODUS OBLIQUUS, St. J. and W 78 



Fig. 10 a. Maxillary posterior tooth, right ramus from above, outline restored; 10 b, 

 do., transverse profile from inner margin; 10 c, do., longitudinal profile 

 from antero-lateral border; 10 d, do., postero -lateral border. Chester 

 limestone; Chester, Ills. Dr. Hambach. 



TENIODUS EEGULAKIS, St. J. and W 77 



Fig. 11 a. Maxillary posterior tooth, left ramus, view from above, outline restored; 

 11 b, do., profile from inner margin; 11 c, do., outer iurolled margin; 11 d, 

 do., from the antero-lateral border; 11 e, do., postero-lateral border; 11 

 /, do., inferior surface. W T arsaw limestone; vicinity of Bedford, Indiana. 

 0. St. John. 



Fie. 12 a. Maxillary (?) posterior tooth, left ramus, seen from above, enlarged; 12 b, 

 do., longitudinal profile from antero-lateral border; 12 c, do., postero- 

 lateral border; 12 d, do., transverse profile from inner margin; 12e,do., 

 outer inrolled extremity; 12 /. do., inferior surface. Upper Burlington 

 limestone, fish-bed; Pleasant Grove, Iowa. 



