PLATE VIII Continued. 



PAGE. 



PCECILODUS VAESOVIEKSIS, St. J. and W 131 



Fig. 13 a. Maxillary posterior tooth, left ramus, seen from above anterior border 

 restored in outline, enlarged one diameter; Warsaw; above Alton, Illi- 

 nois. Mr. Van Home. 



Fig. 14 a. A larger example of the same form, view from abovo, anterior portion of 

 crown mutilated; 14 b, do., transverse profile from inner margin. Same 

 formation, locality and collection. 



PCECILODUS CESTIUENSIS, St. J. and W 135 



Fig. 15 a. Maxillary posterior tooth, right ramus, from above, outline partially re- 

 stored; 15 6, do., from the inner margin; 15 c, do., outer inrolled margin; 

 Chester; Chester, Illinois. Mr. Van Home. 



Fig. 1C a. Mandibular posterior tooth, left ramus, view from above; 16 b, do., inner 

 margin; 16 c, do., outer inrolled margin; 16 d, do., profile from antero- 

 lateral border; Chester; Chester, Illinois. Professor Worthen. 



Fig. 17 a. A small example of the same form, right ramus, from above, showing the 

 transverse corrugations; Chester; Chester, Illinois. Professor Worthen. 



PCECILODUS WORTHENI, St. John 136 



Fig. 18 a. Mandibular posterior tooth, left ramus, view from above, outline partially 

 restored; 18 b, do., transverse profile from inner margin; 18 c, do., outer 

 inrolled margin; 18 d, do., longitudinal profile antero-lateral border; 

 Chester; Chester, Illinois. 



PCECILODUS SPBINGEEI, St. J. and W 13S 



Fig. 19 a. Mandibular posterior tooth, left ramus, view from above, outline partially 

 restored: 19 b, do., transverse profile from inner margin; 19 c, do., outer 

 inrolled margin; Lower Carboniferous; Santa Fe, New Mexico. Messrs. 

 Springer and St. John. 



PCECILODUS CARBONAKIUS, St. J. and W 139 



Fig. 20 a. Mandibular posterior tooth, right ramus, view from above, outline partially 

 restored; 20 b, do., transverse profile from inner margin outline; 20 c, 

 do., outer inrolled margin; 20 d, do., outline profile from antero-lateral 

 border; Upper Coal Measures; LaSallo, Illinois. Professor Worthen. 

 Fig. 21 a. Maxillary posterior tooth, right ramus, seen from above, outline restored; 

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

 Same formation, locality and collection. Professor Worthen. 







