PLATE 8. 



Fenestella angustata. 



Figs. 1-8, 



Fenestella angustata, Hall. Eeport of State Geologist for 1886, page 54. 



Fig. 1. An enlargement from tlie non-celluliferoiis face, showing straight 



rigid branches and elongate fenestrules. 6 x. 

 Fig. 2. An enlargement from another frond showing more broadly oval 



fenestrules and nodose branches. 6 x. 

 Fig. 3, A still further enlargement from fig. 2, showing more distinctly the 



ornamentation of the surface. 18 x. 

 Fig. 4. An enlargement showing slender branches and subquadrangular 



fenestrules. 6 x. 

 Fig. 5. An enlargement from the celluliferous face showing the form and 



disposition of the cell apertures. 6 x. 

 Fig. G. An enlargement showing the branches covered with minute nodes. 



6x. 

 Fig. 7. A transverse section of the branches. 6 x. 

 Fig. 8. An enlargement of a lateral view, showing a transverse section of 



the dissepiments and the position of the cell apertures. 6 x. 



Fenestella emaciata. 

 Figs. 9-13. 

 Fenestella emaciata, Hall. Eeport of State Geologist for 1886, page 57. 

 Fig. 9. A fragment, natural size. 



Fig. 10. An enlargement from the non-celluliferous face, showing the stri- 

 ated granulose branches and the oblique dissepiments. 

 Fig. 11. An enlargement from the celluliferous face, showing the form and 



disposition of the cell apertures. 6 x. 

 Fig. 12. A transverse section of the branches. 6 x. 



Fig. 13. A lateral view of the branches, showing the dissepiments and 

 position of the apertures. 6 x. 



