PLATE XLVII—Continued. 
Fenestella STELLATA. 
Page 109. 
See Plate 45. 
Fig. 20. An enlargement of the non-celluliferous face of a frond, having branches quite rapidly and 
broadly widening to the bifurcations, and with strong, oblique spiniform nodes. (X 6.) 
Fig. 21. An enlargement from near the base of a specimen, with the branches very much thickened. (X 6.) 
Fig. 22. An enlargement from the same specimen as fig. 20, but at a greater distance from the base, show¬ 
ing strongly striated, nodose branches. (X 0.) 
Fig. 23. An enlargement, showing branches very gradually increasing in width, frequently of essentially 
the same size for their entire length, and regularly oval fenestrules which are slightly wider 
than the branches. (X 6.) 
Fig. 24. An enlargement of a portion of the celluliferous face of a frond, showing numerous very large 
cell apertures, usually occurring near a dissepiment. (X (5.) 
Fig. 25. An enlargement of an oblique view of a portion of the celluliferous face of a specimen, to show 
the appearance and height of the elevations along the middle of the branch. (X 6.) 
Fig. 26. A lateral view of a branch enlarged, showing the nodes, and narrow dissepiments at right 
angles to the axis of the branch. (X 6.) 
Fig. 27. A lateral view of a branch enlarged, to show the strongly elevated nodes on the celluliferous face, 
the oblique nodes on the non-celluliferous face, and the oblique dissepiments. (X 6.) 
Fig. 28. A lateral view of a branch, showing regular nodes and dissepiments of a greater height than 
those of the two preceding specimens. 
Fig. 29. An enlargement of a portion of the celluliferous face of a frond, showing the form and arrange¬ 
ment of the cell apertures, and the nodose elevation along the middle of the branch. 
Fig. 30. An enlargement of a portion of the celluliferous face of a frond, showing the cell apertures filled 
with mineral matter, and a channel along the middle of the branches and sometimes along 
the dissepiments. This is the most frequent condition of this species. (X 6.) 
Fig. 31. An enlargement of the top of a node or elevation ; a is the end of a narrow node. (X 16.) 
Fig. 31a. The stellate summit of a node like fig. 32b. 
Fig. 31b. An enlargement, giving a lateral view of the upper part of a simple node. (X 16.) 
Fi gr, 32. a. An enlargement of the top of an elevation, and 6. the side of the same elevation or node, all 
gradations of elevations or nodes between fig. 316. and 326. occur. (X 16.) 
Fig. 32a. The summit of a more simple form of node than 32b. 
Fig. 32b. An enlargement,, giving lateral view of a more elevated form of node with plicated upper mar¬ 
gins and stelliform summit. (X 16.) 
Fig. 33. A fragment of a frond, natural size, showing the comparative size of the branches and the mode 
of growth. 
Fig. 34. A fragment, natural size. 
Fig. 35. An enlargement of the non-celluliferous face of a frond. (X 6.) 
Fig. 36. An enlargement of the celluliferons face of a frond. (X 6). Figures 34, 35 and 36 are doubtfully 
referred to this species. 
Upper Helderberg group. Falls of the Ohio river. 
