234 
PALAEONTOLOGY OF NEW YORK. 
FAVICELLA, n. g. 
Favicella inclusa. 
PLATE LVIII, FIGS. 21, 22. 
ThaUostigma inclusa. Hall. Trans. Albany Institute, vol. x, p. 188. 1881. 
“ inclusayora (in error), Hall. Report of State Geologist for 1883, p. 33. 1884. 
Zoarium consisting of thin lamellate expansions, free or incrusting other 
objects; thickness of observed specimens 1 mm. Cells tubular, cylindrical, 
for nearly one-half their length parallel with, and resting upon the epi- 
theca, then somewhat abruptly bending, continue almost rectangular to the 
former portion, opening directly outward. Intercellular tissue vesiculose, 
apparently forming tuhuli about two-thirds the diameter of the cell tubes, 
divided by thin, closely disposed septa. Cell apertures circular, diameter 
about .25 mm., usually regularly distant a little more than the diameter of 
an aperture. Peristomes slightly and equally elevated. Midway between 
the cell apertures are comparatively strong, sharply angular ridges, which 
unite and enclose the apertures in pentagonal or hexagonal vestibular areas. 
The surface between the ridges and apertures is flat and occupied by minute, 
angular mesopores, about ten in the space of 1 mm. 
Surface marked by low monticules, the centers of which are distant from 
each other about 4 mm., and having cell apertures larger than those on other 
portions of the frond, the vestibular areas having a diameter of nearly 
1 mm. 
This is a characteristic form, and very distinct from any other at present 
known in this geological horizon, with the exception of Fistulipora con- 
strida, which sometimes resembles it in having circular cell apertures, with 
thin, slightly elevated peristomes, surrounded by angular elevations; but it 
differs in having the whole interapertural space raised in angular elevations, 
with minute, obscure mesopores occupying every portion. It resembles Seleno- 
pora tirtinda and S. complexa, of the Upper Helderberg group, in having the 
cell apertures enclosed in polygonal areas, but in those species both the 
elevations and cell apertures are oblique, the apertures are strongly denticu- 
