PLATE XXII. 



Cyathophyllum eobustum n. sp. 



Figs. 1, 2. Lateral view and interior of the cup of a young individual. 



Fig. 3. Lateral view of a very large specimen, showing irregular growth. 



Fig. 4. View of the cup of the preceding specimen. 



Fig. 5. Transverse section near the middle of specimen fig. 3. 



Fig. 6. An enlargement of a portion of the same section, to show more distinctly the character ot 



the interradial vesicular plates. 

 Fig. 7. Interior of the cup of a smaller specimen. 

 Fig. 8. Lateral view of the same, showing the curvature. 

 Fig. 9. Longitudinal section of a similar specimen, showing the depth of the cup and the character 



of the interradial vesicular plates. 

 Fig. 14. An enlargement from the surface of specimen fig. 2, showing the radiating lamelte and 



the form of the interradial vesicles. 



These specimens are all from the Hamilton group of Western New York. 



Cyathophyllum nepos n. sp. 



Figs. 10, 11. Lateral view and interior of the cup of a specimen of the species. From the Hamil- 

 ton group, Livingston county, N. Y. 



Cyathophyllum nakum u. sp. 



Figs. 12 and 13. Two views of a specimen, showing the character of the surface and form ot the 

 corallum. Hamilton group, Moscow, N. Y. 



The interior of the calyx is illustrated on plate x.xxi, fig. 14. 



