PLA TE XL 



HyOLITHES GIBliOSUS H. (£• W. 

 Page 243. 

 Fig. 1. View of the ventral or larger side, showing the form of the shell and extent 

 of the projecting lip. 

 " 3. Profile view, showing the convex side and curvature of the shell. 

 " 3. Outline, showing the regular convexity and form of the transverse section 

 of this species. 



Pal^,acm^a typica H. (C TF. 



Page 243. 

 Fig. 4. View of the upper side of the largest specimen found. (Natural size.) 

 " 5. Lateral view of the same, showing the height of the apes. 



Crania famelica H. £ W. 



Page 336. 

 Fig. 6. The profile of a specimen of medium size, attached to Orthis impressa, and 

 also the ventral valves of three other individuals. 

 ' 7. Ventral view of another Individ lal, showing the prevailing form, which is 



but slightly elevated. 



Stropeobonta Canace H. (& W. 



Page 236. 

 Figs. 8 and 9. Dorsal and ventral views of a specimen, exhibiting the general char- 

 acters of the species. 

 Fig. 10. Outline, showing the regular curvature of the valves. 

 " 11. Interior of a ventral valve, showing the form of muscular impressions and 

 crenulations of the hinge line. 



Spirifera subvaricosa IL (X- W. 



Page 237. 

 FiG.S. 13-15. Dorsal, ventral, cardinal and profile views of a specimen, exhibiting the 

 usual features of the species. 



Spirifera Orestes II. ct- W. 



Page 237. 

 FiG. 16. Dorsal view of a small specimen, with rounded cardinal angles, and having 



much the appearance of S. gregdHa, of the Upper Helderberg limestone. 

 Figs. 17-19. Dorsal, ventral, and profile views of a specimen of the ordinary form, 



showing the bifurcating plications of the mesial fold. 

 Fig. 30. Dorsal view of a large individual, showing the large cardinal area and 



fissure. 



Spirifera cyrtinji:formis 11. cC- IT. 



Page 238. 

 Figs. 31-34. Dorsal, front, profile and cardinal views of a sju'cimen of ordinary form 

 and size of this species. 



