PLATE XVI—Continued. 
PALESCHARA 1NCRUSTANS. 
Page 35. 
Fig. 15. 
Fig. 16. 
Fig. 17. 
Fig. 18. 
Fig. 19. 
Fig. 20. 
Fig. 21. 
A specimen incrusting the surface of Spirifem perlamellosa, natural size. 
Lower Helderberg group. Clarksville, N. Y. 
An enlargement from the preceding, contrasting with fig. 14. 
An enlargement from the surface of another specimen, showing slightly larger and more regular 
arrangement of the cell apertures. 
A Trematapora incrusted with this species. 
Lower Helderberg- group. Clarksville, N. Y. 
An enlargement from the preceding, showing the arrangement of cell apertures, which are smaller 
than in fig. 16. 
A zoarium incrusting Streptalasma strictum. 
Lower Helderberg group. Clarksville, N. Y. 
An enlargement from the preceding, showing form and arrangement of cell apertures. 
PALESCHARA ? (LlCHENALrA ?) HI LATERALIS. 
Page 36. 
Figs. 22, 23. A fragment of a larg-e frond, natural size, and an enlargement showing cell arrangement; the 
margins of the cell apertures appear to have been worn away. 
Lower Helderberg group. Clarksville, N. Y. 
Paleschara concentrica. 
Page 67. 
Fig. 24. An enlargement of a portion of a foliate expansion of this species. 
Lower Helderberg group. Clarksville, N.- Y. 
MONOTRYPA ? SPINOSULA. 
Page 67. 
Fig. 25. An enlargement of a portion of the specimen showing the elevated maculae and unequal cell 
apertures. 
Tentaculite limestone. Schoharie, N. Y. 
