Nczv Bryozoa from Nebraska. — Condra. 343 
Zooecia in two regularly alternating ranges (sometimes three for 
a short distance below a bifurcation). The two ranges are widely 
separated by the broad area. Apertures circular or subcircular, usually 
two, rarely three to each fenestrule, 0.08 mm. across, 0.12 mm. 
across including the peristome, with the peristome slightly less than 
their own diameter apart, twenty-four in five mm. 
These specimens are not apt to be confused with any 'A the de- 
scribed species. The reverse face resembles, to a degree, that of F. 
conradi Ulrich, but is of smaller proportions and without perforated 
nodes. The circular to subcircular fenestrules, wide area or carina, 
and rather robust appearance serve to distinguish the specimens from 
related species. Some authors would classify this species with the 
genus Polypora. The name is suggested by the circular fenestrules of 
the reverse face. Type specimens in the museum of the University 
of Nebraska, Lincoln, Nebraska. 
F'osition and locality: Coal Measures; Bennett, Nebraska. Quite 
plentifully represented at that locality, being found in a thin layer of 
impure limestone, in the creek bed, about two miles below town. 
Fenestella spinulosa n. sf>. 
PI. XXI. Figs. 4, 5. 
Zoarium a fa.i-shaped expansion, commonly found fragmentary. 
One complete abnormal zoarium, resembling Ptilopora in its mode of 
growth, is 4 cm. high by 3 cm. wide. Its main branches are 0.28 to 
0.30 mm. in diameter and give rise, from their sides, at very acute 
angles, to smaller branches, 0-2 to 0.25 mm. wide; also, the latter may 
originate by bifurcation. Branches of normal zoaria, on the reverse, 
straight, cylindrical, faintly striated or granulose, 0.28 mm. wide, vary- 
ing some in distance apart, usually about their own diameter apart, 
about nine or ten in 5 mm. The obverse face has a rounded carina, 
quite well elevated, bearing a row of conical spines 0.07 to o.i mm. in 
''iameter at their bases in young growth, averaging 0.25 mm. distance 
from apex to apex, usually two to each fenestrule, disposed so that 
one occurs near the end of each dissepiment and one between; they 
about equal one series of zooecial apertures in number. In older 
growth the spines are larger, and quite obscure the apertures. 
Dissepiments on the reverse, straight, cylindrical, with very little 
terminal expansion, not much depressed, average width one-third that 
of the branches ; depressed on the obverse face. Fenestrules rectang- 
ular, vary in size, 0.35 to 0.45 mm. long by 0.2 to 0.3 mm. wide ; not so 
regular on the obverse, only slightly modified by the zooecial apertures, 
nine and one-half to ten in 5 mm. 
Zooecia small, in two alternating ranges, about two times their own 
diameter apart, subcircular, in some specimens pustuliform, others 
have faint peristomes, project little into the fenestrule, nineteen or 
twenty in 5 mm. 
