PLATE XXIII 



PA6E 



Figs. 1-4. FAVOSITES PYRIFORMIS Hall 211 



1. Transverse section. X 1. 



2. Same. X 2. 



3. Longitudinal section. X 1. 



4. Same. X 2. 



Helderberg formation, Keyser member, Cumberland. 



Figs. 5-7. FAVOSITES CONICUS Hall 212 



5. 6. Side view and base of characteristic form. 



7. Longitudinal section of several cells. X 2. 



Helderberg formation, Becraft member, cut of B. & O. R. R. 

 through North Mountain, W. Va. 



Figs. 8, 9. FAVOSITES BASALTICUS Goldfuss 212 



8. Portion of corallum. 



9. Enlargement of several cells. X 2. 



Helderberg formation, Cumberland. 



