20 



8. Goniatitcs complanatus. A Cephalopod. Commoner in 



Portage above. Found at very base of Genesee shale 

 from Cayuga lake to Lake Erie. 



9. Fragment of a stem of a plant, common in uppermost Gen- 



esee ledges. 



(Portage Pelecypoda.) 



10. Cardiola (species?). Lower Portage sandstone horizon, 



westward. 



11. Cardiola retrostriata. 



westward. 



12. Palceoneilo Jilosa. Middle Portage, eastward. Eastern 



Chemung. 



13. PalcEoneilo constricta. East and west Portage and east 



Chemung. 



14. Nucula corbidiformis, probably. East Portage and east 



Chemung. 



15. Modiomorpha subalata var. chemungensis. Portage, east- 



ward. 



16. Leptodesma sociale. Middle Portage shale; western Che- 



mung. 



17. Lunulicardium fragile. Genesee and middle Portage beds. 



18. Actinopteria boydi. Middle Portage and eastern Chemung. 



19. Go?iiophora cf. minor. Middle Portage, eastward. 



20. Microdon bellistriatus. Middle Portage, eastward and east 



Chemung. 



21. Grammy sia subarcuata. 



22. Grammy sia elliptica. 



23. Schizodus chemungensis. Middle Portage, eastward and 



eastern Chemung. See also PL X, fig. 77. 



24. Mytilarca chemungensis, variety. Middle Portage, east- 



ward and east and west Chemung. See also PL X, 



fig- 73- 



25. Spathella typica. Middle east Portage and east Chemung. 



Note. The figures shown on this and other plates are usually from one- 

 half to two-thirds life size. 



