34 PLATE XVI. [Assembly 



Fossils of the Portage group. 



1. Crinoid : Cyathocrinus ornatissimus ( p. 69, 47). 



2, 3, 4, 5. Fragments of its stalk or column. 



6. lucina retusa. 



7. Orthis tenuistriata. 



8. Spirifer l^vis : beak, hinge, and triangular opening for the 



byssus ( p. 40). 



9. Same, outside of lower valve. 



10. GONIATITES SINUOSUS. 



11. Gr. BICOSTATUS. 



12. ASTARTE SUBTEXTILIS. 



13. NUCULA LINEOLATA. 



14. Bellerophon STRIATUS. 



Fossils of the Genesee slate. 



15. Chonetes setigera. 



16. AVICULA FRAGILIS. 



17. Tentaculites. 



18. Fragment, with Avicula fragilis. 



