PLATE YII Continued. 



PAGE. 



CUITONODUS TEIBULIS, St. J. and W ........................................ 117 



Fig. 18 a. Maxillary posterior tooth, left ramus, a large and nearly perfect example, 

 seen from above; 18 b do., from tne inner margin: 18 c do., outer inrolled 

 margin; 18 d do., from an tero -lateral border, foreshortened. Keokuk; 

 Keokuk, Iowa. Mr. Cox. 



Fig. 19 a. A small maxillary posterior tooth, left ramus, from above. Keokuk lime- 

 stone; Warsaw, 111. Prof. Worthen. 



Fig. 20 a. A medium-size tooth of the same form, right ramus, from above, outline 

 restored. Same formation. Bentonsport. Iowa. Mr. St. John. 



Fig. 21 a. Mandibular posterior tooth, left ramus, a small example, seen from above; 

 21 b do., from inner margin; 21 c do., outer inrolled margin; 21 d do., from 

 antero-lateral border. Keokuk; Keokuk, Iowa. Mr. Cox. 





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