PLATE IV. 



PAKE. 

 Fig. 1. RHIZODUS OOCCIDKNTAI.IS, N. and W., vol. ii, p. 19. 



View of a Fcale preserved in f=ha!e, natural eiz<\ 

 Fig. 2. PLATYSOMCS CIRCULARIS, N. and W 347 



View of a specimen of natural size. 

 Fig. 3. SANDALODCS CRASSUS, N and W 369 



3. Superior surface of a specimen of ordinary size. 

 3 a. Section of the same. 



Fig. 4. LOPHODUS VARIABILIS, N. and W 361 



4. Anterior face of tooth, natural size. 



4t a. " " viewed from above. 



46. " " posterior face. 



fi, 5 a. Anterior and posterior of another specimen, natural size. 



11. Anterior face of central ? tooth, natural size. 



11 a. Po teri r face of the same. 

 116. " " seen in profile. 



Fig. 6. CLADODUS ISCHYPUS, N. and W 354 



6. Anterior face of tooth, natural size. 



6 a. " " " seen in profile. 



Fig. 7. CYMATODUS OBLONGUS, Js T . and W 364 



7. Crown surface, natural size. 



7 a. Profile of the same. 



Fig. 8. DELTODUS LITTONI, K and W 367 



8. Upper surface of a specimen of large size. 



8 a. The same, seen in profile. 



Fig. 9. CLADODUS ELEGANS, N. and W 3.j4 



View of the posterior face of tooth, natural size, and section of median cone. 

 Fig. 10. POLYRHIZODUS LITTONI, X. and W 3C7 



10. Anterior face of tooth, natural size. 



10 a. Section of the same 



