PLATE VII. 



FaVOSITES 8PHERICU8. 



Pag« 9. 

 See Plate 8. 

 Fig. 1. A vertical section showing the columns and illustrating the mode of growth. 



Lower Helderberg group. Clarksville, N. T. 

 Fig. 2. A lateral view of a specimen showinjj the depressed conical form, the expanded margin being in 

 part broken away. 



Lower Helderberg group. /Schoharie, N. Y. 

 Fig. 3. A jwrtion 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 gi-oup. Schoharie, N. T. 

 Fig. 5. An individual of this species, which is more distinctly laminateil in its moiie of growth. The 

 coral commenced its gi-owth upon the stem of a crinoid which it entirely enveloped, hut the 

 latter has subsequently become exposed fi-ora the weatl»ering away of the coral. 

 Lower Helderberg group. Schoharie, N. Y. 

 Fig 6. An elongate form, having the same structure iis the massive forms. 



Lower Helderberg group. ClarksnUle, N. Y. 

 Fig. 7. A jwrtion of a massive form which has been perforated by some boring animal, and now pre- 

 serves the filling of these cavities. 



Lower Helderberg group. Schoharie, N. Y. 

 Fig. 8. An enlargement from the specimen fig. 1. The columns ai-e essentially smooth. 

 Fig. 9. An enlargement of the columns from another specimen, erroneously showing mural pores. 



Lower Helderberg group. Schoharie, N. Y. 

 Fig. 10. An enlargement from fig. 3, showing the columns with corrugated surface. 



Lower Helderberg group. Clarkxville, N. T. v 



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 PROXIMCS. 

 Page 10. 

 Fig. 13. An irregular hemispheric mass showing the mode of growth. 



Lower Helderberg group. Schoharie, N. Y. 

 Fig. 14. An enlargement of the surface showing the cell apertures. 



Fig. 15. An enlargement from a translucent section showing the septa and obscurely the mural pores. 

 Lower Helderberg grroup. Schoharie, N. Y. 



