PLATE XXXIII. 
Thamniscus multiramus. 
Page 104. 
Figs. 1-3. Specimens, natural size ; showing the form and mode of branching - . 
Fig. 4. An enlargement of a portion of fig. 3. The surface is weathered or macerated, so that the re¬ 
cumbent portions of the cell-tubes are shown ; a small part of the surface is preserved, show¬ 
ing the form and arrangement of the cell apertures. 
Fig. 5. An enlargement of the non-celluliferous side of a specimen, showing sharp striations. (X 0.) 
Upper Helderberg- group. Schoharie, N. Y. 
Crisinella scrobiculata. 
Page 103. 
Fig. 6. A specimen, natural size, showing the form and mode of branching. 
Fig. 7. An enlargement of a portion of the non-celluliferous side of fig. 6, showing fine striations, and 
cell-tubes projecting beyond the margin. 
Fig. 8. An enlargement of a portion of the celluliferous side of fig. 6, showing the form and arrangement 
of cell apartures, and the shallow intercellular pits on a portion of the surface. 
Upper Helderberg group. Western New York. 
Thamnotrypa divaricata. 
Page 101. 
Fig. 9. A specimen, natural size, showing the form and mode of branching. 
Fig. 10. An enlargement of a portion of one side of fig. 9, showing the non-celluliferous margins the 
central ridge, and the form and arrangement of cell apertures. 
Upper Helderberg group. Near Buffalo, N. Y. 
Glauconome SINUOSA. 
Page 101 
Fig. 11. A specimen, natural size, showing- the form and mode of growth. 
Fig. 12. An enlargement of a portion of the celluliferous side of fig. 11, showing more distinctly the mode of 
growth, the sinuous carinse, and the form and arrangement of the cell apertures. 
Upper Helderberg group. Near Buffalo, N. Y. 
Glauconome nodata. 
Page 102. 
A specimen, natural size, showing the form and mode of branching, 
An enlargement of a portion of the celluliferous side of fig 13, showing more distinctly the mode 
of growth, the form and arrangement of cell apertures. 
Upper Helderberg group. Near Be Boy, N. Y. 
Fig. 13. 
Fig. 14. 
