PLATE XXXIII— Continued. 
Glauconome TENUISTRIATA. 
Page 102. 
Fig-. 15. A specimen, natural size, showing- the form arid mode of branching-. 
Fig. 16. An enlargement of the non-celluliferous side of fig-. 15, showing- more distinctly the mode of 
branching, and the line striations. 
Fig. 17. An enlargement of a portion of the celluliferous side of another specimen, showing the narrow 
carina, and the form and arrangement of the cell apertures. (X 6.) 
Fig-. 18. An enlargement of the non-celluliferous side of a specimen; a portion of the surface has been 
worn away, showing the polygonal cells. 
Fig-. 19. An enlargement of the celluliferous side of a specimen. The specimen is macerated, the surface 
having-been worn away, showing the striated character of the solid portion of the branch. 
Upper Helderberg group. Near Buffalo, N. Y. 
CoSCINIUM STRIATURUM. 
Page 88. 
Fig. 20. A specimen, natural size, showing the size and position of the perforations, and indistinctly the 
cell tubes. 
Fig. 21. An enlargement of a portion of tig. 20, showing one of the perforations; the form and arrange¬ 
ment of the cell apertures, with coarsely striated texture beneath the exterior surface. 
Upper llelderberg group. Stafford, N. Y. 
COSCINOTRYPA CR1BRIFORMIS, VU1'. CARINATA. 
Page 8U. 
See Plate 29. 
Fig. 22. A specimen, natural size, showing a strongly elevated carina, and the form and arrangement of 
the perforations. 
Fig. 23. The reverse side of the preceding specimen. 
Fig. 24. An enlargement of a portion of fig-. 22, showing the carination, the aspect of the perforations, 
and the form and arrangement of the cell apertures ; the surface is somewhat macerated, and 
the cell apertures are not in a perfect condition. 
Fig. 25. An enlargement of a portion of fig. 23. 
Upper Helderberg group. Falls of the Ohio river. 
