Plate V. — Continued . 



PAQIC. 



Fig. 18-22. Mesodmodus exsculptus, St. J. and "W 291 



18 a. View of posterior face of a large, perfect tooth, enlarged one-half. Kinderhook 



beds ; Burlington, Iowa, 



19 a, b, c. Views of posterior and outer faces and profile section of smaller, median tooth 



from opposite side of the jaw, enlarged one-half. Saoie horizon andlocality. 



20 a, 6, c, d. Views of posterior and outer faces, outline from above, and profile section of a 



linear posterior tooth, enlarged two diameters. Same horizon and locality. 

 81 a, b, c, d. Views of outer and inner faces, outline from above, and profile section of a large 

 anterior tooth, enlarged two diameters. Same horizon and locality. 



22 a, o, c, d. Similar views of smaller anterior tooth from opposite side of the jaw, enlarged 



two diameters. Same horizon and locality. 

 Fig. 23. OitODrs ? taeatxelus, St. J. and TV 295 



23 a. Front view of two teeth, enlarged three diameters; 23 6, view from the inner 



side; 23c, base from below; 23 d\ outline from above; 23 e, profile section. 

 Kinderhook beds ; Richmond, Iowa 



Fig. 24. Orodus CARIXATUS, St. J", and "W 307 



24 a. View of posterior face, enlarged two diameters; 24 6, outer face; 24 c, outline 



from above ; 21 d, profile section. Keokuk limestone ; Bentonsport, Iowa. 



Fig. 25. Lambdodus reflf.xus, St. J. and W 284 



25a. Front view of tooth; 25 6, side view, out'ine. Chester limestone; Chester, 



Illinois. 



Fig. 26. Lambdodus hamatds, St. J. and TV 283 



26 u. Front view ; 26 6, side view ; 26 c, view from above, cone truncated, and section 



across base. Chester limestone; Chester, Illinois. 



