PLATE VI. 



Spirifera euruteines. 



Fig. 1-7, 9, 11-17. A series of specimens showing principal varieties of 



form. Page 115 



Fig. 21, 22. View of two specimens broken so as to show the spiral 

 cones. 



Spirifera euruteines, var. fornacula. 



Fig. 8, 10. Cardinal and ventral view of a large specimen. Page 117 



Fig. 18, 19, 20. Dorsal, ventral and profile view of a small specimen. 



