PLATE III. 



MlCHELINlA LENTICULAKI8. 



Page 7. 

 Vig. 1. The summit of a specimen of ordinary dimensions. The cells are partially filled with the original 

 matrix, and their full foi-m and depth is therefore not represented in the iig^ure. 

 Lower Helderberg gi^up. Schoharie, iV. T. 

 Fig. 2. A profile of the preceding specimen. 



Fig. 3. A.n enlargement of a single cell, which is partially filled with rock. 

 Fig. 5. The base of an example, preserving the epitheca and pedicel of attachment. 

 Lower Helderberg group. Sclioharie, N. T. 



Favosites conicus. 



Page ». 

 An enlargement of some of the cell tubes, showing the mural pores. 



The summit of a yoxmg specimen which is imperfect from the presence of some extraneous object 

 which has become imbedded in it during growth. 



Lower Helderberg group. Clarksville, df. Y. 

 The base of a specimen which partially preserves the epitheca. 



Lower Helderberg group. Clarksville, N. Y. 

 The base of a small specimen with the epitheca presei'ved on one side. 



Lower Helderberg group. ClarksniUe, N. Y. 

 A vertical section of the oi-dinary full-sized specimen, showing the cell tubes and mural pores. 



Lower Helderberg gi-oup. Clarksville, X. Y. 

 A vertical section showing the cell walls and septa. 



Lower Helderl^erg group. Near Cumberlaiul, Md. 

 An outline showing form and size of the largest specimen of the species observed. 



Lower Helderberg group. Clarksville, N. Y. 

 A lateral view of a large individual showing the cell apei'tures and preserving t^e epitheca near 

 the base. 



Lower Helderberg group. Clarksville, N. Y. 

 Fig. 13. The base of the same, showing a partial preservation of the epitheca in some parts. 



Striatopoka Issa. 



Page 0. 

 Fig. 14. A fragment of a specimen, natural size. 



Fig. 16. An enlargement, showing the striations on the inner side of the cell walls and the mural pores. 

 Lower Helderberg group. Clarksville, N. Y. 



