PLATE IV Continued. 



PAGE. 



16 a. Mandibular posterior tooth, left ramus, an imperfect example, seen from 



above; 16 l>, do., inner margin; 16 c, do., profile from anterior border. 

 Keokuk limestone; Hamilton, 111. Prof. Worthen. 



Fig. 17-19. VATICINODUS? SIMILIS, St. J. and W 86 



17 a. A mature perfect posterior tooth of the right ramus of upper jaw, view from 



above; 17 b, do., inner margin; 17 c, do., outer inrolled margin; 17 d, do., 

 foreshortened, from posterior extremity. Chester limestone; Evansville, 

 Illinois. Dr. George Hambach. 



18 a. An imperfect specimen of the same form, from left ramus, seen from above; 



18 b, do., inner margin. Chester; Chester, 111. Mr. Van Home. 



19 a, Mandibular posterior tooth, left ramus, seen from above, enlarged; 19 b, do., 



inner margin; 19 c, do., antero-lateral border. Chester; Chester, 111. 

 Prof. Worthen. 



Fig. 20. VATICINODUB? CABB:NAEIUS, St. J. and W 88 



20 a. Maxillary posterior tooth, left ramus, seen from above, outline restored; 20 b. 



do., from inner margin. Lower Coal Measures; Carlinville, 111. Prof. 

 Worthen. 

 Fig. 21. YATICINODUS? LEPIS, St. J. and "W 88 



21 a. Maxillary posterior tooth, right ramus, view from above, outline restored; 



21 b, do., from inner margin, transverse profile. Upper Coal Measures; 

 LaSalle, 111. Prof. Worthen. 



Fig. 22-26. VATICINODUS? SIMPLEX, St. J. and W 84 



22 a. Maxillary posterior tooth, right ramus, an imperfect specimen showing the 



posterior coronal contour, from above, enlarged; 22 b. do., inner margin; 



22 c, do., outer margin. St. Louis limestone; Pella, Iowa. O.St. John. 



23 a. Same form, left ramus, showing an entire tooth, coronal surface much worn, 



seen from above; 23 b. do., inner margin. St. Louis, Mo. O. St. John. 



24 a. A similar example, showing basal rim extending beyond coronal limits. St. 



Louis limestone; St. Louis, Mo. Prof. Worthen. 



25 a. Mandibular posterior tooth, left ramus, view from above, outer extremity 



restored in outline. St. Louis limestone; Pella, Iowa. O. St. John. 



26 a. A nearly entire example of same form, right ramus, seen from above; 2G b, 



do., inner margin; 26 c, do. antero-lateral border. St. Louis limestone; 

 Pella. O. St. John. 





