90 
PALAEONTOLOGY OF NEW YORK. 
STICTOPORA, Hall. 1847. 
Stictopora Gilberti. 
PLATE XXVII, FIGS. '20-35 ; and PLATE XXVIII, FIGS. 21, 22. 
PtilodictycL ( Stictopora) Gilberti, Meek. Proc. Acad. Nat. Sci., Phila. 1871. 
Stictopora Gilberti (Meek), Hall. Trans. Albany Institute, vol. x, abstract, p. 13. 1871. 
“ “ Hall. Report of State Geologist for 1882. Expl. pi. 25, figs. 21, 22. 1883. 
“ “ “ Report of State Geologist for 1885, advance sheets. Expl. pi. 27, figs. 20-35. 
1886. 
Cystodict-ya Gilberti (Meek), Ulrich. Journal Cincinnati Soc. Nat. Hist. Amer. Pal. Bryozoa. PI. 2, fig. 
5, 5a, 5 b. 18S4. 
Zoarium consisting of a dichOtomously branched frond, proceeding from a 
spreading base; transverse section lenticular, abruptly contracting to the 
margins; width of branches from 4 to 6 mm.; margins diverging ; greatest 
thickness .75 mm., width of non-celluliferous margin slightly less than 1 
mm.; bifurcations occur at intervals of from 5 to 10 mm. Cells tubular, 
length from 1.50 to 1.75 mm., for about one-half their length essentially 
parallel to the mesotheca, then turning abruptly outward. Cell apertures 
oval, length about .25 mm., width from one-half to three-fourths the length; 
the marginal apertures slightly larger than those on other portions of the 
frond ; disposed in longitudinal rows, which increase by interstitial addi¬ 
tions. Rows separated by prominent ridges, which sometimes have a 
depression along the middle. Peristomes strong, distinctly and equally 
elevated, each one with a defined lunate process, the extremities presenting 
two prominent denticulations, which in the course of growth form two parallel 
ridges on the inner surface of the cell walls. The denticulations are invariably 
situated on the outer margin of the aperture. Intercellular space irregularly 
vesicular. 
This species may be distinguished from Stictopora incissurata, of the Hamil¬ 
ton group, by its frequent bifurcations and the rapid increase in width of the 
branches; these characters and its larger size distinguish it from S. ovatipora; 
it differs from S. semistriata, by its more frequent bifurcations, strong 
denticulations of the apertures, and more prominent continuous intercellular 
ridges. 
