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PLATE III. 
Micheltnia lenticularis. 
Page 7. 
1. The summit of a specimen of ordinary dimensions. The cells are partially filled with the original 
matrix, and their full form and depth is therefore not represented in the figure. 
Lower Helderberg group. Schoharie, N. Y. 
2. A profile of the preceding specimen. 
3. An enlargement of a single cell, which is partially filled with rock. 
5. The base of an example, preserving the epitheca and pedicel of attachment. 
Lower Helderberg group. Schoharie, N. Y. 
Favosites CONICUS. 
Page M. 
4. An enlargement of some of the cell tubes, showing the mural pores. 
6. The summit of a young specimen which is imperfect from the presence of some extraneous object 
which has become imbedded in it during growth. 
Lower Helderberg group. Clarksville, N. Y. 
7. The base of a specimen which partially preserves the epitheca. 
Lower Helderberg group. Clarksville, N. Y. 
8. The base of a small specimen with the epitheca preserved on one side. 
Lower Helderberg group. Clarksville, N. Y. 
9. A vertical section of the ordinary full-sized specimen, showing the cell tubes and mural pores. 
Lower Helderberg group. Clarksville, N. Y. 
10. A vertical section showing the cell walls and septa. 
Lower Helderberg group. Near Cumberland, Md. 
11. An outline showing form and size of the largest specimen of the species observed. 
Lower Helderberg group. Clarksville, N. Y. 
12. A lateral view of a large individual showing the cell apertures and preserving- the epitheca near 
the base. 
Lower Helderberg group. Clarksville, N. Y. 
13. The base of the same, showing a partial preservation of the epitheca in some parts. 
Striatopora Issa. 
Page 0. 
14. A fragment of a specimen, natural size. 
15. An enlargement, showing the striations on the inner side of the cell walls and the mural pores. 
Lower Helderberg group. Clarksville, N. Y. 
