PLATE 10. 



Fenestella (Loculipora) perforata. 



Figs. 1-13. 



Fenestella (Loculipora) perforata, Hall. Eeport of State Geologist for 



1886, page 62. 

 Fig. 1. A large fragment, showing the general appearance and manner 



of growth, natural size. 

 Fig. 2. An enlargement from the non-celluliferous face, showing the 



angular, slightly carinated branches connected by dissepiments^ 



6x. 

 Fig. 3. Eock deposit, showing the impressions of a portion of the non- 

 celluliferous face of a frond. 6 x. 

 Fig. 4. A translucent longitudinal section. 6 x. 

 Fig. 5. An enlargement of the celluliferous face, showing the angular 



branches and the disposition of the cell apertures around the 



fenestrules. 6 x. 

 Fig. 6. An enlargement showing the summit of the carina or pseudo- 



non-celluliferous face. 6 x. 

 Fig. 7. A transverse section showing the elongate rhomboidal section of 



branches and carinas. 6 x. 

 Fig. 8. A transverse section of the branches, showing the broadly rhom- 

 boidal form of the branches and summit of the carinfB. 6 x. 

 Fig. 9. An enlargement showing distinctly the appearance of the branches 



and carina of the dissepiments. 18 x. 

 Fig. 10. A transverse section of a frond embedded in the rock. 6 x. 

 Fig. 11. The appearance of a translucent, longitudinal section, greatly 



magnified. 

 Fig. 12. A lateral view of a branch, showing the form of the dissepiments, 



and pseudo-dissepiments, the carina, and the position of the 



cell apertures. 

 Fig. 13. A transluscent, longitudinal section, on glass, greatly magnified. 



Formation and Locality. — Hamilton group, near Canandaigua 

 lake, N. Y. 



Fenestella nexilis, n. sp. 

 Figs. 14-15. 

 Fig. 14. An enlargement of a portion of the celluliferous face, showing 

 the form and disposition of the cell apertures and the sinuous 

 carinse. 6 x. 

 Fig. 15. An enlargement from the non-celluliferous face, showing the 

 angular carinated branches and dissepiments. 

 Formation and Locality.— Cornif erous limestone. 



