72 
BULLETIN OF THE LABORATORIES 
small flabellate species, forming a rather closely woven network. The 
species is probably new, but as both show only the reverse and, as the 
characters of the more important opposite could not be ascertained, it 
is not described. The specimens are from the Cuyahoga shales about 
thirty feet below the Carboniferous conglomerate, at Cuyahoga Falls. 
Another specimen from a layer of ferrugenous freestone at Bag- 
dad shows only the obverse and that not in a satisfactory manner. As 
near as can be determined it belongs to a species either very closely 
related to or identical with F. miiltispinosa,'^ Ulrich, a Keokuk spe- 
cies occuring in Kentucky, Iowa and Illinois. It also agrees rather 
closely with Meek’s description of his F. delicata, described from 
nearly the same horizon at Lodi. 
Several other species of this genus known to me from the Ohio 
Waverly series are too imperfect for satisfactory comparisons. 
POLYPORA IMPRESSA.n. sp. 
(Plate XIII, Figs. 8, 8a.) 
Zoarium small, flabellate. Branches comparatively slender, be- 
tween 0.4 mm. and 0.62 mm. wide, about four in r mm.; bifurcations 
frequent, occuring at intervals of from i mm. to 5 mm., the intervals 
being shortest near the base. Zooecia mainly in two ranges, but where 
the distance between the bifurcations is more than 3 mm., a third 
range is interpolated. Apertures small, strongly elevated, with the 
margin denticulate when perfect. Over at least the upper half of the 
zoarium there is a Urge, oval, rather shallow, yet more or less sharply 
margined impression behind most of the apertures. Near the base 
of the frond these impressions are either very indistinct or quite obso- 
lete, and the zooecia apertures rise from the surface of the branch very 
much as in certain species of Stomatopora and other Cyclostomata. 
In the branches with only two ranges of zooecia the apertures are 
situated along the border of the branch and frequently project a little 
over it. About fourteen zooecia in each range in the space of 5 
mm. Dissepiments slender, slightly depressed, finely striated, gen- 
erally less than half as wide as the branches. Fenestrules elongate, 
varying in shape and size, from 1.5 mm. to 3.0 mm. long, the width 
equalling generally about half their length and one and a half or two 
times the width of the branches. 
