PLATE LVlll. 



PAOE. 



Fig. 1. DiPLODi's LATUS, Newb 44 



Broad form, 

 la, 1&. Front aud side views, ahowing tubercle ol' base. 



Fig. 2. DiPLODus coMPREssuSj Newb 45 



Front view. 



Fig. 3. D;pL0Dus gracilis, Newb ■ 45 



3a. Small form. 



Fig. 4. Cladodus ActrMiNATus, Newb 45 



Posterior face. 



Fig. 5. Clal>oous Hertzeri, Newb 4t> 



Posterior aspect. 

 5a. Side view and section ol' central cone. 



Fig, t>. Cl\dodus Pattehsoni, Newb 47 



Posterior face ajid section of cone. 

 6a. Profile section. 



Fig. 7. Cladodus subulatus, Newb 47 



Posterior face and section of cone. 



Fig. 8, Cladodus concinu.s, Newb 48 



Posterior section and base. 



Fig, 9. Cladodus parvulus, Newb 48 



Posterior face and base. 

 9a. Small form, with lateral denticles. 



Fig. 10. PoLYRHTZODus MODESTUS, Newb 50 



Anterior face. 

 10a. Profile section. 



Fig. 11. Orodus variabilis, Newb 50 



Posterior face of large tooth. 

 Ila, 116. Crown and anterior aspects. 

 He, lift-. Views of smaller teeth of same series. 



Fig. 12. Orodus elegantulus, Newb 41 



Crown posterior face. 

 12a. Enlarged view of same. 



Fig. 18. Pei'alodus Alleghaniensts, Newb 52 



"Anterior face of average specimen. 

 13a. Anterior face of small tooth. 



Fig. 14. Ctenoptychius semtcircularis, N. and W 52 



Anterior fnce. 



Fig. 15. Ctenodus serratus, Newb 59 



Upper surface of right? lower teetb. 

 15a. Profile of one of the serrated ridges. 



Fig. 16. Ctenodus serratus? Newb 59 



Small palate tooth of upper ? jaw. 



Fig. 17. DiPTERUs Sherwoodi, Newb 61 



Crown surface. 

 17a. Side view. 

 nb. Profile of one ridge. 



Catsltill group, Tioga county, Pennsylvania. 



Fig. 18. Heliodus Lesleyi, Newb 64 



Upper surface of upper ? palate tooth. Natural size. 

 Cbemuiifi grouji, Tioga county. Pennsylvania. 



