Neiv Bryozoa from Nebraska. — Condra. 347 
small spines with diameters of 0.07 mm. and placed at distances of 
0-22 mm. 
Dissepiments slightly expanded terminally, depressed some on 
each face, slightly on the reverse, o-i to 0.13 mm. wide in the middle, 
wider in older growth. Fenestrules quite regular in form, subrect- 
angular, vary some in dimensions with different conditions of growth, 
modified little by zooecial apertures, average 0.65 mm. long by 0.25 
mm. wide, long for the width, about six in 5 mm. A larger form has 
longer fenestrules. 
Zooecia in two alternating straight ranges. Apertures with fairly 
prominent peristomes, about their own diameter apart, set close in 
against the carina, facing outward, four and rarely five to each fenes- 
trule, twenty-three to twenty-five in 5 mm. The species resembles F. 
dentata Rogers but is not so robust. That species has eight branches 
in 5 mm., each being 0-4 mm. in diameter. The fenestrules average 
0-9 mm. long by 0.3 mm. wide, with four in 5 mm. This species has 
more and smaller nodes as well as twenty-three to twenty-five instead 
of eighteen zooecia, for each range, in 5 mm. The fenestrules are 
shorter. Type in the museum of the University of Nebraska, Lincoln, 
Nebraska. 
Position and locality: Coal Measures; Roca, Nebraska. 
Fenestella polyporoides n. sp. 
PI. XXII. I'igs. 6, 7. 
Zoarium a strong reticulate expansion. Several specimens each 3 
or 4 cm. high have been found. Branches robust, cylindrical, striated 
on the reverse, straight or flexuous, flexures bending to and away 
from the dissepiments, 0.35 to 0.4 mm. wide, 0.5 mm. below a bifur- 
cation, six in 5 mm. The obverse face has a well developed carina 
o.i mm. across, somewhat flexuous, bearing a row of prominent nodes 
0-5 to 0.6 mm. apart. Dissepiments expanded terminally about one- 
half as wide as the branches. Another form has smaller dissepiments 
and larger fenestrules; fenestrules subelliptical to subquadrangular, 
large in typical specimens, 0.9 to 1.05 mm. by 0.4 mm. inside measure- 
ment, eight in i cm. 
Zooecia in two or three ranges, sometimes three for a short dis- 
. tance below a bifurcation, four or five in each range to the fenestrule. 
seventeen or eighteen in 5 mm. ; apertures circular, 0.13 mm. across 
including the peristome, a little more than their own diameter apart, 
project very little into the fenestrule. 
The species is related to F. kansanensis Rogers and F. dentata 
Rogers; F. burlingtonensis Ulrich difl^ers in the size of the nodes, but 
has as many apertures. Specimens sent to E. O. Ulrich were pro- 
nounced by him members of the genus Polypora. However, the writer 
is inclined to place them with the fenestellas. The main specific char- 
acters are found in the resemblance to the polyporae and in the large 
dimensions. 
