PLATB 9. 



Fenestella subtortilis. 



Figs, 1-5. 



Fenestella subtortilis, Hall. Keport of State Geologist for 1886, page 52. 



Fig. 1. A fragment, natural size. 



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



of the branches and dissepiments and large fenestrules. 6 x. 

 Fig. 3. An enlargement from the cellnliferous face, showing the narrow 

 fenestrules, the form and disposition of the cell apertures, and 

 one or two of the branches with the carina. 6 x. 

 Fig. 4. A transverse section of the branches. 6 x. 



Fig. 5. A lateral view of the branch showing a transverse section of the 

 dissepiments, the position of the cell apertures and the carina. 

 6x. 



Fenestella parallela. 



Figs. 6-11. 



Fenestella paymllela, ILall. Pal. N. Y., Vol. VI, p. 107. 



Fig. 6. A fragment showing the expanded carina, natural size. 



Fig. 7. An enlargement from the non-celluliferous face showing the form 



of the branches and dissepiments, and the granulose surface. 



18 X. 

 Fig. 8. An enlargement from the celluliferous face showing the form and 



arrangement of the cell apertures and the basal portion of the 



carinas of the branches and dissepiments. 18 x. 

 Fig. 9. An enlargement of the expanded summits of the cariiiEe. 18 x. 

 Fig. 10. A lateral view of a branch, showing a transverse section of the 



dissepiments, and their carina3 much expanded at the summit, 



the position of the cell apertures, and the carina of the branch. 



18 X. 

 Fig. 11. A transverse section showing the form of the branches, the 



expansion of their carinte at the summit and the dissepiments 



with their carina. 18 x. 



Fenestella feequens, n. sp.. 

 Figs. 12-15. 



Fig. 12. An enlargement from the non-celluliferous face showing the fre- 

 quent dissepiments. 



Fig. 13. An enlargement from the celluliferous face showing the form and 

 disposition of the cell apertures. 6 x. 



Fig. 14. A transverse section of the branches. 6 x. 



Fig. 15. A lateral view of a branch showing the position of the dissepiments 

 and the high carina. 6 x. 



Fenestella (Lyropoka) cinctuta. 



Fig. 16. 



Fenestella (Lyropora) cinctuta, Hall. Eeport of State Geologist for 1886, 



page 69. 

 Fig. 16. An enlargement from the non-celluliferous face showing the 

 strong thickened border and the rounded or somewhat trans- 

 versely oval fenestrules. 6 x. 



