PLATE XI Continued. 



PLATE. 

 DELTODOPSIS EXOKNATUS, ? St. J. and W .................................. 168 



Fig. 14 a. Mandibular posterior tooth, right ramus, view from above, outline of alate 

 posterior border restored; 14 l>, do., longitudinal profile from the antero- 

 lateral border. Warsaw: above Alton, Mr. Van Home. 



Fig. 15. DELTODOPSIS ? BIALVEATUS, St. J. and W ..................... . ........... 169 



Fig. 15 a. Mandibular median tooth, left rainus, view from above; 15 b, do., transverse 

 profile from inner margin; 15 c, do., from the outer extremity: 15 d, do., 

 inferior surface; 15 e, do., aiitero-lateral border; 15 /, do., postero- 

 lateral border. U. Burlington; Louisa county, Iowa, Mr. St. John. 



Fig. 16. D. '. KEOKUK, St. J. and W ................................................... 169 



Fig. l(i a, 7), c, d, e, f. Mandibular median tooth, left ramus, same views as above. 



Keokuk limestone. -i eiBioao: 



Fig. 17. J>. > i-oni'c.rKx. 17 u, Mandibular median tooth, left ramus, from above; 



17 t, do., from inner margin; 17 c, do., antero-lateral border, basal rim 



restored in outline. U. Burlington; Louisa county, Iowa, Mr. Springer. 

 Fig. 18. I). : j conve.i:us. 18 a, Mandibular median tooth, right ramus, seen from 



above; 186, do., transverse profile from inner margin; 18 c, do., outer 

 . extremity; 18 d, do., inferior surface; 18 e , /, antero- and postero-lateraL 



borders. U. B.: Louisa county, Iowa, 0. St. J. 



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