Plate IX — Continued. 



PAGE. 



Fig. 19-2-1 . Yenustodus TEKTJICRISTATTJB, St. J. and "W 343 



19 a. Concave face of small tooth, of normal shape, showing borders of convex side ; 19 6, 



convex face ; 19 c, profile section. Keokuk limestone; vicinity of Warsaw, 111. 



20 a. A more slender tooth, in which the apex is less prominent, seen from above. Same 



horizon and locality. 



21 a. View from above of large, robust tooth, showing compressed crest, and laterally com- 



pressed median codb ; 21 b, convex face, basal band imperfect from wear ; 21 c, pro- 

 file section. Same horizon and locality . 



22 a- A. large, elongated tooth, seen from above; 22 o, convex face, the worn crest restored 



in outline ; 22 c, <Z, profile sections at middle and extremity of tooth. Same horizon 

 and locality. 



23 a. View from above of small, linear, eveu-crested tooth ; 23 6, profile section. Same hor- 



izon and locality . 

 2-1 a. Concave face of small, triangular, acuminate tooth ; 24 b, convex face, base restored in 

 outline ; 24 c, outline view in profile. Same horizon and vicinity. 



