256 
PALAEONTOLOGY OF NEW YORK. 
Stictopoiia lobata, n. sp. 
KOT FIGURED. 
Zoarium consisting of a flattened, dichotomously branched frond, proceeding 
from a spreading base, which is attached to foreign objects. Branches from 
2 to 2.50 mm. in width, margins sub-parallel, the branches slightly expand¬ 
ing before bifurcating; non-celluliferous marginal space narrow, width a 
little more than .25 mm.; transverse section lenticular, greatest thickness 
.75 mm.; on the margins of the branches, at intervals of a little more than 
1 mm., are lobes or projections, extending beyond the margin about .75 mm., 
and having a width of about 2 mm.; they have the appearance of aborted 
lateral branches; the cell apertures upon them extend entirely to the 
margin; bifurcations comparatively infrequent, occurring at intervals of 
8 mm. or more on the specimens observed. Cells tubular, recumbent for 
the greater portion of their length, then abruptly turning and opening 
directly outward. Intercellular tissue consisting of irregularly disposed 
vesicles. Cell apertures oval, length about .20 mm., width from one-half to 
two-thirds the length, disposed in longitudinal, nearly parallel rows, about 
six rows on each face of the branch; apertures of the rows separated 
by less than their length; the apertures on the lobes are larger and less 
regularly disposed. Peristomes strong, posterior portion a little the more 
elevated, smooth, not denticulated. Ranges of apertures separated by prom¬ 
inent, narrow, nodose ridges, which have a width of about two-thirds that 
of the apertures; nodes small, regularly disposed, about equal in number to 
the cell apertures. 
In its manner of growth this species most nearly resembles S. palmipes, but 
the lobes are never prolonged into lateral branches, the frond is more rigid in 
appearance, the margins more nearly parallel, and the frond is without the 
thin, wide, non-celluliferous marginal space characteristic of that species ; from 
other species it may be distinguished by its marginal lobes. 
Formation and locality. Reed’s Corners, near Canandaigua lake, Ontario 
county, N. Y. 
