CORALS AND BRYOZOA. 
209 
FISTULIPORA, McCoy. 1849. 
(See pages 27, 87.) 
Fistulipora longimacula. 
NOT FIGURED. 
Thallostigma longimacula, Hall. Trans. Albany Institute, vol. x, p. 185. 1881. 
“ “ “ Report of State Geologist for 1883, p. 23. 1884. 
Zoarium consisting of lamellate expansions, incrusting other objects, thickness 
from .50 to 1.50 mm.; no masses formed by the accretion of successive layers 
of growth, have been observed. Cells tubular, round or sub-angular, oblique 
or rectangular to the surface; septa infrequent or entirely wanting. Inter¬ 
cellular space vesiculose; near the base the vesicles are irregularly disposed, 
and more regularly superimposed above, giving the appearance of septate 
tubuli; septa numerous, fifteen or twenty in the space of 5 mm. Cell aper¬ 
tures oval or trilobate, frequently sub-quadrangular, length a little more than 
.20 mm., width about two-thirds the length, regularly and irregularly dis¬ 
posed, comparatively distant. Peristomes thin, sometimes equally elevated, 
at other times the posterior portion is the - more strongly elevated and has 
occasionally two slight denticulations. Mesopores variable in size, frequently 
larger than the cell apertures; margins slightly elevated, smooth. Surface 
marked by low, elongate monticules, at the middle of each there being a com¬ 
paratively deep depression, having a length of between 3 and 4 mm., and a 
width of little less than 1 mm., destitute of cell apertures and occupied by 
mesopores; the adjacent apertures are larger than the others and radiate 
from the depressions in straight lines, forming elevated rows, gradually grow¬ 
ing smaller as they recede. The. cell apertures on the other portions of the 
frond are irregularly disposed. 
The cell apertures in size and shape resemble those of Lichenalia cultellata , but 
this species will be easily distinguished from that one by the elongate monticules 
with depressed centers, and the presence of mesopores; these features will dis¬ 
tinguish it from any other species at present known, from this geological 
formation. 
Formation and locality. Hamilton group, York, Livingston county, N. Y. 
