PLATE VII. 
Favosites sphericus. 
Page 9. 
See Plate 8. 
Fig. 1. A vertical section showing the columns and illustrating the mode of growth. 
Lower Helderberg group. Clarksville, N. Y. 
Fig. 2. A lateral view of a specimen showing the depressed conical form, the expanded margin being in 
part broken away. 
Lower Helderberg group. Schoharie, N. Y. 
Fig. 3. A portion of a coral growing in an irregular form. 
Fig. 4. A specimen which has grown upon the base of the stem of Lepadocrinus. 
Lower Helderberg group. Schoharie, N. Y. 
Fig. 5. An individual of this species, which is more distinctly laminated in its mode of growth. The 
coral commenced its growth upon the stem of a crinoid which it entirely enveloped, but the 
latter has subsequently become exposed from the weathering away of the coral. 
Lower Helderberg group. Schoharie, N. Y. 
Fig 6. An elongate form, having the same structure as the massive forms. 
Lower Helderberg group. Clarksville, N. Y. 
Fig. 7. A portion of a massive form which has been perforated by some boring animal, and now pre¬ 
serves the tilling of these cavities. 
Lower Helderberg group. Schoharie, N. Y. 
Fig. 8. An enlargement from the specimen tig. 1. The columns are essentially smooth. 
Fig. 9. An enlargement of the columns from another specimen, erroneously showing mural pores. 
Lower Helderberg group. Schoharie, JSf. Y. 
Fig. 10. An enlargement from tig. 3, showing the columns with corrugated surface. 
Lower Helderberg group. Clarksville, N. Y. 
Fig. 11. An enlargement of the surface showing the form of the cell openings. 
Lower Helderberg group. Clarksville, N. Y. 
Fig. 12. An enlargement of the open cells from a translucent section, showing comparatively few and 
irregularly distributed septa (X 6). 
Favosites proximus. 
Page 10. 
An irregular hemispheric mass showing the mode of growth. 
Lower Helderberg group. Schoharie, N. Y. 
An enlargement of the surface showing the cell apertures. 
An enlargement from a translucent section showing the septa and obscurely the mural pores. 
Lower Helderberg group. Schohane, N. Y. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
