OF DENISON UNIVERSITY. 
67 
Obverse: — Branches twenty-two or twenty-three in 10 mm., very 
slender, nearly straight, diverging with moderate rapidity, the bifurca- 
tions occuring at intervals varying between 5 mm. and 15 mm.; av- 
erage width about 0.33 mm., just above a bifurcation about 0.25 mm. 
increasing to about 0.40 mm. at the next division. Carina thin, in- 
conspicuous, often sinuous, generally nodose, the nodes nearly as nu- 
merous as the zooecia apertures. ^ Zooecia in two ranges, eighteen or 
nineteen in each in 5 mm.; apertures sub-circular, a little oblique, their 
diameter apart, with a distinct though thin peristome projecting slight- 
ly so as to indent the border of the fenestrules ; three or four opposite 
each fenestrule. Dissepiments very slender, about half as wide as the 
branches, depressed, sub-angular, occasionally channeled, scarcely ex- 
panding at their ends. Fenestrules oblong-quadrangular, the length 
equaling about twice the width, between ten and eleven in lomm.f 
On the reverse^ the branches and dissepiments are rounded and 
either faintly striated or nearly smooth. 
This delicate species is readily distinguished from the F. albida, 
Hall, with which it is usually associated by its thinner branches, finer 
and more regular net work, and the fenestrules being much smaller. 
The species is related to F. compressa, Ulrich,* from shales of the 
Keokuk group at King’s Mountain, Ky. What may prove to be 
identical form occurs in the “Division beds” at the top of the Burling- 
ton limestone. The specimens so far seen, however, are too illy pre- 
served to admit of a satisfactory determination of this point. 
Formation and locality :-*“Upper Waverly, (Cuyahoga shale) at 
Richfield, O. 
FENESTELLA FOLIATA n sp. 
(Plate XIII, Fig. 4.) 
Zoarium a small, sub-circular, flabellate or leaf-shaped expansion, 
not known to exceed 1 7 mm. in height by 1 5 mm. in width. 
Obverse: — Branches slender, diverging rapidly, more or less flex- 
uous, particularly near the base, eight or nine in 5 mm., with an av- 
tHall’s measurements relating to the dissepiments and fenestrules differ 
widely from what is shown in his figures. He says, “about five in the space of 
lo mm.,” but figures i, 2 and 3 agree with the specimens before me in showing 
ten or eleven in that space . 
