PLATE XIX. 



PAGE. 

 PSAMMODUS ANGULAEIS, Bt. J. and W 222 



Fig. 1 a. Mandibular tooth, seen from above; 1 b, do., from posterior margin; 1 c, do., 

 transverse profile from the anterior margin; 1 d, do., longitudinal profile 

 from the articular border; 1 e, do., from the exterior border, outline par- 

 tially restored. Original specimen PI. XI, f. 2, 2 a, 2 I), Vol. II, 111. Geol. 

 Survey, Chester; Chester, 111. Prof. Worthen. 



Fig. 2 a. Maxillary tooth, showing the triturating surface, outline partially restored; 

 2 l>, do., transverse profile from the posterior margin; 2 e, do., anterior 

 margin; 2 d, do., longitudinal profile from inner articular border; 2 e, 

 exterior border. Original of "P. porosit?," PI. XI, f. 1 a, 1. 111. Geol. 

 Survey, II. Chester. Chester, III. Prof. Worthen. 



PSAMMODUS BETICULATU?, N. and W 224 



Fig. 3 a. Mandibular tooth, view from above, the triturating coronal surface much 

 worn, outline partially restored; 3 b, do., transverse profile from the 

 posterior margin; 3 c, do., anterior margin; 3 d, do., inner articular bor- 

 der, longitudinal profile; 3 e, do., from the exterior border. Chester: 

 Chester, 111. Prof. Worthen. 



Fig. 4 a. Maxillary tooth, an immature example, showing slightly worn triturating 

 surface, outline partially restored; 4 b. do., from the posterior margin; 

 4 c, do., from the articular border. Original specimen, PI. XI, f. 5, 5 a. 

 111. Geol. Survey, II. Chester; Chester, 111. Prof. Worthen. 



Fig. 5 o. Maxillary tooth, showing a worn triturating surface; 5 b, from the anterior 

 margin; 5 c, do., articular inner border. Chester; Chester, 111. Dr. 

 Hambach. 



