4 PLATE II. [Assembly 



Fossils of the Birdseye limestone. 



12. Orthoceras multicameratum ( p. 41). 



13. Phytopsis tubulosum (as seen in the broken edge of the strata). 



This is the plant described on page 41. 



Fossils of the Trenton limestone. 



1. Trocholites ammonius (p. 47). 



2. Pleurotomaria lenticularis ( p. 47). 



8. SUBULITES ELONGATA. 



4. Cyrtoceras (a curved form of Orthoceras). 



5. BUCANIA PUNCTATA. 



6. Bellerophon bilobattjs ( p. 47). 



7. Ch^tetes lycoperdon ( p. 48). 



8. Strophomena alternata. 



9. Orthis pectinella. 



10. 0. testudinaria. 



11. Strophomena deltoidea. 



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