200 
PALAEONTOLOGY OF NEW YORK. 
diameter a little more than 1 mm.; the apertures immediately adjacent are 
slightly larger than those on other portions of the frond. 
This species, in its manner of growth and general appearance, is similar to 
Fistulipora utriculus, of Rominger, but the apertures are circular, while in that 
species they are decidedly trilobate; the manner of growth is similar to that of 
Lichenalia, clivulata, of the Upper Helderberg group, but the apertures are much 
larger and more closely disposed, the denticulations are much less conspic¬ 
uous, and the peristomes are equally elevated; the surface resembles that of 
F. interaspera, but the manner of growth is different, there is no depression 
at the centre of the monticules, the denticulations are much less prominent, 
and there are no interapertural pits: from F. constricta it is distinguished by 
its manner of growth, its less prominent monticules, the flattened or gently 
convex interapertural space, and the absence of mesopores; the size of the 
cell apertures and strength of denticulations are about the same in both species: 
from F. unilinea it is distinguished by its manner of growth, less prominent 
monticules, smaller and more distant cell apertures, the absence of mesopores, 
and the somewhat stronger denticulations: from Lichenalia cornuta by the 
manner of growth, larger and more distant cell apertures, and the much less 
prominent denticulations: from Lichenalia substellata, of the Upper Helderberg 
group, by the manner of growth, the thin and equally elevated peristomes, and 
the granulose surface. 
Formation and locality. Hamilton group, West Williams, Ontario. 
Lichenalia colliculata. 
NOT FIGURED. 
Lichenalia colliculata, Hall. Trans. Albany Institute, Vol. x, p. 184. 1881. 
“ “ “ Report of State Geologist for 1883, p. 36. 1884. 
ZoAitiUM consisting of free or incrusting lamellate expansions, or of masses 
formed by the accretion of successive layers of growth; epitheca strongly 
wrinkled concentrically, frequently contorted. Cells tubular, cylindrical, 
oblique or rectangular to the surface; septa thin, in some cells moderately 
