PLATE VIII. 



PTILOPORINA. 



(Page 507.) 

 Ptiloporina pinnata, Hall. 

 Fig. 1. An enlargement of the noncelluliferous face. This figure is 

 inserted here for comparison with Ptilopoba. 



PTILOPORA. 



(Page 519.) 

 Ptilopora striata, Hall. 



Fig. 2. Noncelluliferous face. x6. 

 Fig. 3. Celluliferous face. x6. 



Hamilton group. Moscow, Livingsto % county, N. Y. 



Ptilopora mFREQUEKs, Hall. 

 Fig. 4. A fragment, natural size. 

 Fig. 6. The same specimen. x6. 

 Fig. 7. Noncelluliferous face of a fragment. x6. 

 Hamilton group. Western New York. 



Ptilopora nodosa, Hall. 



Fig. 5. The celluliferous face of a fragment. x6. 

 Hamilton group. Near Alden, N Y. 



GLAUCONOME. 



(Page 524.) 

 Glauconome sinuosa. Hall. 

 Figs. 8, 9. Fragments, natural size. 

 Fig. 10. The celluliferous face. x6. 



Upper Helderberg group. Near T>eroy, N Y. 



Glauconome tenuistriata, Hall. 

 Fig. 11. A fragment, natural size. 

 Fig. 12. The noncelluliferous face. x6. 

 Fig. 13. The celluliferous face. x6. 



Upper Helderberg group. Near Buffalo^ N Y. 



Glauconome carinata. Hall. 



Fig. 14. Fragments, natural size. 



Fig. 15. The noncelluliferous face. x6. 



Hamilton group. Fall Brook, four miles east of Canandaigua 

 Lake, N Y. 



634 



