PLATE 32. 



Page 

 Figs. 1-9. Spirifera divaricata 213 



1. An imperfect dorsal valve of this species. From the Comiferous limestone. 

 2-6. Ventral, dorsal, profile, front and cardinal views of a large and very perfect specimen, from 

 the shales of the Hamilton group. 



7. An enlargement of the surface, showing the bifurcating plications and the concentric stria. 



8. Still further enlargement, showing the rugose character of the concentric striae, 



9. The cast of a ventral valve, from the Comiferous limestone. 



