PLATE Xa. 



PAGE. 



Fig. 1. Harpacodus compactus, St. J. and TV 355 



1 a. "View of concave face of tooth, enlarged two diameters; 1 h; profile section. Chea- 



ter limestone; Cli ester, Illinois. 

 Fig. 2. Harpacodus occidextai is, St. J. and TV 355 



2 a. Concave crown face, enlarged two diameters ; 2 &, convex fiice ; 2 c, outline from 



above; 2 d, profile section. St Louis limestone; Alton, Illinois. 

 Fig. 3,4. Chomatodus pahai.lklus. St. J. and TV 358 



3 a. Concave crown face of nearly perfect tooth ; 3 6, convex face ; 3 c, profile section. 



"Warsaw beds. 



4 a. Convex face of less robust tootb. "Warsaw beds ; above Altou, Illinois. 



Fig. 5. Chomatodus insigxis, (Leidy sp.) r 359 



5 a. Concave face of nearly entiie specimen ; 5 b, convex aspect; 5 c, profile section. 



St. Louis limestone; St. Louis, Missouri. 

 Fig. 6. Pristodus ? acusjinatus, St. J. and W 402 



6 a. Convex crown f;ice enlarged ; fi 6, concave face ; 6 c, outline from above ; 6 d, pro- 



file section. Kinderhook beds; Burlington, Iowa. 



Fig. 7-9. Desmiodus tumidus, St. J. and W 339 



7 a. Concave aspect of tooth, enlarged four diameters; 7 &, convex face; 7c, outline 



from above ; 7 d, profile section. St. Louis limestone ; Alton, Illinois. 



e a. View of series of four teeth, from above, enlarged two diameters ; 8 6, profile out- 



line of anterior border; 8 c, outline from above, still further enlarged. Same 

 horizon and locality. 



9 a. A series of seven teeth, seen from above, enlarged. Same horizon j St. Louis, Mo. 



Fig. 10, 11. Desmiodus costelufeuus, St J. and W 341 



10 a. View of convex aspect of tooth, enlarged four diameters ; 10 6, concave face ; 10 c, 



outline of crowu from above ; 10 d, profile sectiou. St. Louis limestone; St. Louis, 

 Missouri. 



11 a, b, c. Similar views of an elongated tooth, enlarged four diameters. Same horizon ; 



Alton, Illinois. 

 Fig. 1-2-14. Desmiodus ? ugomfokmib, St. J. and TV 342 



12 a, b, c. Views of concave aud convex faces, and profile section, enlarged two diameters. 



Keokuk limestone; Boouville, Missouri. 



13 a, 6. Convex face and profile section of similar tooth, enlarged two diameters. Same 



horizon ; Bentonsport, Iowa. — 



14 a, b. Concave and convex faces of larger, robust worn tooth, enlarged two diaineters. 



Same horizon, Boonville, Missouri. 

 Fig. 15. Desmiodus? flabeu.um, St. J. and W 343 



15 a. Concave face, enlarged two diameters; 15 6, convex face; 15 c, profile section. 



Keokuk limestone ; Boonville, Missouri. 



Fig. 16. LlSGODUS SE1.LULIFORMIS, St. J. and W ,:S66 



lt> a,b,c,d. Views of concave and convex faces, outline from above, and profile section, 



enlarged two diameters. St. Louis limestone; Alton, 1111. ois. 



Fig. 17 19. LlSGODUS SERKATUS, St. J. and TV 3C5 



17 a,b,c. Views of concave and convex faces, and outline of crown from above, enlarged 



two diameters. Upper Burlington limestone ; Louisa county, Iowa. 



18 a, b, c. Concave aud convex faces, and profile section of slightly stronger tooth, enlarged 



two diaraeteis. Same horizon and locality 



19 a,B,c. Similar views of a large, robust tooth, enlarged two diameters. Same horizon 



and locality. 



