CORALS AND BRYOZOA. 
223 
more regularly disposed above, but not having the appearance of septate 
tubuli. Cell apertures arched or sub-triangular, diameter .25 mm., fre¬ 
quently nearly rectangular to the surface, often regularly arranged, 
alternating and sub-imbricating, separated by about the diameter of an 
aperture. The upper portion of the cell walls are exposed for .25 or .30 mm. 
Mesopores minute, margins scarcely elevated above the surface, and having, 
at the angles, minute nodes or granules. Surface marked by low, rounded 
monticules, the centers of which are distant about 6 mm., having a sterile 
space of 1.50 mm., in diameter, which is occupied by mesopores slightly larger 
than those between the apertures. The nodes or granules frequently obscure 
the mesopores so that the centers of the monticules and inter-apertural spaces 
have the appearance of a solid granulose surface. 
This species may be distinguished from Lichenalia colliculata by the less 
elevated and more distant monticules, the non-radiation of the cells on the 
monticules, and the central sterile space; the inter-apertural space resembles 
that of F. serrulata , but it is easily distinguished from that species by its smaller 
and oblique cell apertures. 
Formation and locality. Hamilton group, Western New York. 
Fistulipora minuta (?). 
PLATE LIX, FIGS. 5-S. 
Compare Fistulipcrra minuta, Rominger. Proc. Acad. Nat. Sci. Phila., p. 120. May, 1866. 
Thallostigma striata, Hall. Trans. Albany Institute, vol. x, p. 186. 1881. 
“ “ “ Report of State Geologist for 18S3, p. 28. 1884. 
Zoarium consisting of thin lamellate expansions, free or incrusting other 
objects, usually Cyathophylloid corals; thickness from .50 to 1 mm.; epitheca 
very thin, concentrically wrinkled. Cells tubular, at right angles to the 
surface, non-septate. Intercellular tissue vesiculose, vesicles comparatively 
large, irregularly disposed at the base, more regularly superimposed 
above, but not forming regular septate tubuli. Cell apertures oval, fre¬ 
quently obscurely sub-polygonal, length .25 mm., width generally about 
two-thirds the length, sometimes nearly equal to it, occurring at irregular 
intervals. Peristomes moderately strong, equally elevated, and when well 
