PLATE II. 



PAGE. 

 Fig. 1. PHYSONEMCS GIGAS, N. and W 378 



1. Lateral view of spine, natural size. t 



1 a. One of the anterior tubercles enlarged. 



Fig. 2. CTENACANTHUS MAYI, N. and W 372 



2. View of a specimen of large size, imperfect at the base. 



2 a. Section of the same. 



Fig. 3. LISTRACANTHUS HYSTRix, N. and W 872 



3. A very large specimen, natural size. 



3 a. View of a very small specimen. 



Fig. 4. ASTEROPTYCHIUS TRIANGULAR^, N. and W 370 



4. Lateral surface of a specimen of medium size, imperfect at base and apex. 



Fig. 5. PETRODUS ? PUSTULOSUS, N. and W 369 



5. Upper surface of a very large specimen. 

 5 a. Profile of the same. 



Fig. 6. DELTODUS ALATITS, N. and W 368 



Superior surface of a large specimen, natural size. 



Fig. 7. PELTODCS TINGUIFORMIS, N. and W 363 



7. View of the basal and anterior crown surface. 



7 a. Profile of the same. 



Fig. 8. ANTLIODUS SARCULULUS, N. and W 356 



8. Posterior face, natural size. 



8 a, 86. Anterior face, and profile of the same. 



PCECILODTIS CONVOLUTUS, N. and W 366 



View of superior surface, natural size. 



10. HELODUS RITGOSTS, N. and W 359 



10. Posterior face of specimen, natural size. 



10 a. Profile of the same. 



