PLATE XI 



PAGE. 



Fig. 1-5. Taxaodus pumilus, St. J", and TV 369 



1 a. View of concave face of perfect tooth of medium size and normal form ; 1 b, convex: 



aspect ; 1 c, profile section. St. Louis limestone ; Pella, Iowa, 



2 a. Concave face of small, triangular-shaped tooth; 2 6, opposite face; 2 c, outline of 



crown from above; 2 d, profile outline. Same horizon and locality. 



3 a. View of concave face of larger tooth, crest worn ; 3 &, convex face; 3 c, profile section. 



St. Louis beds ; Alton, Illinois 



4 a. Concave face of still larger tooth, crest worn plane with basal margins; 4 6, convex 



aspect, outline of crest restored. Same horizon and locality. 



5 a. Concave aspect of small abraded or immature specimen, which has lost the external 



enamel layer, enlarged two diameters ; 5 b, view of convex face, showing sulca- 

 tion of basal area, and worn coronal surface; 5 c, profile section, showing con- 

 cavity of concave face. St. Louis beds ; Pella, Iowa. 

 Fig. 6-10. Tanaodus i-r^xuxtil's, St. .1. and W 371 



6 a. Concave face of large symmetrical tooth ; G o, opposite face ; 6 c, outline of crown from 



above ; 6 d, profile section. St. Louis limestone : St. Louis, Missouri. 



7 a. View from above of a stronger specimen; 7 ft, convex aspect ; 7 c, profile section. 



Same horizon ; Alton Illinois, 

 a a. View from above of similar, laterally arched tooth ; B b t profile section ; 9 a, concave 

 face of same specimen. Same horizon and locality. 



10 a. Concave face of small example ; 10 b, convex face ; 10 c, profile section. St. Louis beds ; 



Pella, Iowa. 

 Fig. 11-13. Taxaodus depressus, St. J. and W 378 



11 a. Concave face of medium size tooth; 11 6, opposite face, showing dentioulate crest ; 11 c, 



profile section. Chester limstone; Chester, Illinois. 



12 a. View from above of an obtuse-crested tooth ; 12 &, convex face; 12 c, profile section. 



Same horizon and locality. 



13 a. Outline from above of small specimen ; 13 b, concave face, enlarged two diameters ; 



13 c, convex aspect ; 13 d, profile section. Same horizon and locality. 

 Fig. 14-16,25. Taxaodus bellictxctus, St. J. and TV 376 



14 a. Concave face of large perfect tooth; 14 6, convex face; 14 c, profile section. Chester 



limestone; Chester, Illinois. 



15 a. Concave face of a worn tooth, in which the coronal folds are scarcely discernible, and 



the root terminated in a wedge-shaped edge ; 15 &, convex face, showing abrasion 

 of basal area ; 15 c, profile section. Same horizon and locality. 



16 a. Concave face of small immature or worn tooth, coronal folds obsolete ; 16 b, convex 



face, showing worn space along the basal angle ; 16 c, profile section. Same hori- 

 zon and locality. 

 25 a, b, c. Similar views of another tooth. Same horizon and locality. 

 Fi g. 17-19, 24. XANA0DU3 POLYMOEPHUS, St. J. and TV 380 



17 a. Concave face of large tooth, enlarged two diameters; 17 b, convex aspect, inferior 



coronal angle worn ; 17 c. profile section. Chester limestone ; Chester, Illinois. 



13 a. Concave face of smaller, less symmetrical tooth, enlarged two diameters; 18ft, oppo- 

 site face, showing sulcation along basal angle ; 18 c, profile section. Same horizon 

 and locality. 



]9 o. Concave aspect of small tooth, enlarged two diameters ; 19 6, opposite face; 19 c, pro- 

 file section. Same horizon and locality. 



24 a, &, c. Views of concave and convex faces and profile section, of an elliptical-shaped tooth, 

 probably referable to the above form, enlarged two diameters. Same horizon and 

 locality. 



