84 
PALEONTOLOGY OF NEW YORK. 
ticulations, more closely arranged monticules, the space at their centers being 
without cell apertures. 
Formation and locality. Upper Helderberg group, Falls of the Ohio river. 
Lichenalia (Pileotrypa) granifera. 
PLATE XXX, FIGS. 2S-31. 
Lichenalia granifera, Hall. Trans. Albany Institute, vol. x, abstract, p. 11. 1881. 
“ ( Pileotrypa) granifera. Report of State Geologist for 1885, advance sheets. Expl. pi. 30, figs. 
28-31. 1SS6. 
Zoarium consisting of lamellate expansions, greatest thickness observed 1.50 
mm. Cell tubes at right angles to the surface, often with frequent constric¬ 
tions; septa occurring at short intervals. Cell apertures ovate, length .35 
mm., width from one-half to two-thirds the length ; closely and irregularly 
disposed. Anterior margin of peristome thin and slightly elevated ; posterior 
portion strongly elevated; denticulations slight or wanting. Maculfe destitute 
of cell apertures, distant from each other 5 mm., diameter 1.50 mm. ; the 
cells immediately adjacent radiate from them, and are larger than the others. 
Intercellular space regularly septate. Surface granulose. 
This species may be distinguished by the constrictions of the cell tubes, the 
ovate cell apertures, with strong posterior margins without denticulations, and 
the granulose surface. 
Formation and locality. Upper Helderberg group, Falls of the Ohio river. 
Lichenalia (Pileotrypa) denticulata. 
PLATE XXVI, FIGS. 21, 22, 23; and PLATE XXX, FIGS. 12-20. 
Lichenalia denticulata, Hall. Trans. Albany Institute, vol. x, abstract, p. 8. 1881. 
“ “ “ Report of State Geologist for 1S82-. Expl. pi. 24, figs. 21, 22, 26. 18S3. 
*• ( Pileotrypa) denticulata. Report of State Geologist for 1885, advance sheets. Expl. pi. 30, 
figs. 12-20. 1886. 
Compare J3?'idopora minima, Ulkich. Coiit. Am. Pal., vol. i, No. 1, p. 21, pi. 2, fig. 6, 6«. 1886. 
Zoarium consisting of thin lamellate expansions, encrusting other objects. Cell 
apertures trilobate, length .25 mm. ; crowded and irregularly disposed. 
Anterior margin of peristome slightly elevated; posterior portion denticulate 
