PLATE IX. 



Spirifera atwaterana. 



Fig. 1-5. Dorsal, ventral, front, cardinal and profile view of a speci- 

 men. Page 107 

 Fig. 6, 7. Dorsal and ventral view of a smaller specimen. 



Spirifera grieri. 



Fig. 8-12. Cardinal, front, dorsal, profile and ventral view of a speci- 

 men. Page 120 

 Fig. 13, 14. Dorsal and profile view of a small specimen. 



