PLATE XLI 



PAGE 

 FigS. 1-5. FlSTULIPORELLA CUMULATA U. Sp 263 



1. Side view of a zoarium, natural size. 



2. Tangential section. X 20. 



3. A portion of the same tangential section, X 40, showing the 



characters of the mature zone. 



4. Several zooecia of the same section, X 40, from a less mature 



portion. 



5. Vertical section, X 20, showing several layers of zoarium. 



Helderberg formation, Keyser member, Keyser, W. Va. 



FigS. 6-8. FlSTtTLIPORELLA QUINQUEDENTATA n. Sp 264 



6. Tangential section, X 20, of the type specimen. 



7. A zocecium of the same, X 50, showing the structure of the lunarium. 



8. Vertical section of the type, X 20. 



Helderberg formation, Keyser member, Keyser, W. Va. 



Figs. 9-12. CHILOTRYPA MICROPORA n. sp 268 



9. Zoarium, natural size, with end view of same, showing sack-like 

 form. 



10. Tangential section, X 20, exhibiting the very small zocecia and 



the rather wide interzooecial spaces. 



11. Vertical section, X 20, through portion of a zoarium illustrating 



the variation in diameter of the central tube. 



12. A portion of the same vertical section, X 40, showing the more 



minute structure of the zooecia (zocec) and vesicles. 

 Helderberg formation, Keyser member, Keyser, W. Va. 



Figs. 13-17. CERAMOPORA ? IXCONDITA n. sp 260 



13. A tangential section, X 12, passing through the mature zone 



where the zocecia and mesopores are most irregular in shape 

 and arrangement. 



14. A similar section, X 12, through an immature portion of the same 



zoarium. 



15. A vertical section, X 12, through both zones of a thin incrusting 



zoarium in which diaphragms appear to be wanting. 

 16, 17. Vertical sections, X 12, showing the usual characters of the 

 mature region. 

 Helderberg formation, Keyser member, Devil's Backbone. 



