PLATE XIX. 
Unless otherwise stated all the figures on this plate are copied from Hall, Nat. Hist. New York, Pal. 
II, 1852.] 
FenesteUa elegans Hall. (Page 51.) 
Fie 1. A frond, natural size, showing the noncelluliferous side. 
2. Celluliferous side of another specimen, enlarged. 
Rochester shale, Lockport, N. Y. 
FenesteUa cribrosa Hall. (Page 50.) 
3. Fragment, natural size, exposing noncelluliferous face. 
4. Portion of same enlarged. 
5. Celluliferous face of another example, X 20, showing protruding zocecia, con- 
spicuous spines on carina, and broad branches. (Original). 
Rochester shale, Lockport, N. Y. 
Semicoscinium tenuiceps (Hall). (Page 52.) 
G. Basal view, natural size, showing funnel-shaped zoarium with carinated cellu- 
liferous face. 
7. Celluliferous surface of a specimen enlarged, with the carina worn or less devel- 
oped than usual, thus exposing the zocecial apertures more cleanly. 
Rochester shale, Lockport, N. Y. 
Polypora incepta Hall. (Page 52.) 
8, 9. Two zoaria, natural size, both exhibiting the noncelluliferous surface. 
10, 11. Noncelluliferous side enlarged to show striated surface. 
12. 13. Two enlargements of the celluliferous face, exhibiting number of rows and arrange 
menl of zocecial apertures. 
Rochester shale, Lockport, N. Y. 
Pseudohornera niagarensis (Hall). (Page 49.) 
[See also PI. XVIII, fig. 20.] 
14. Noncelluliferous face, natural size. 
15. Celluliferous face of another example, X 2. 
16. Fragment of another zoarium, X 3, showing basal attachment and angular crest. 
Figs. 14-16 after Hall, Eleventh Ann. Rept. Indiana Geol. Nat, Hist., 188S 
Waldron shale, Waldron, Ind. 
102 
