PLATE VIII. 



Spirifera acuminata. 



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

 men. Page 105 

 Fig. 6, 7, 8. Cardinal, ventral and dorsal view of an internal cast. 



Spirifera gregaria. 



Fig. 9-13. Ventral, dorsal, front, profile and cardinal view of a speci- 

 men. Page 119 



