Nczv Bryozoa from Nebraska. — Condra. 341 
hollow, irregular branches, while this species is massive. The walls, 
in section, resemble those of S. cestriensis Ulrich, but show smaller 
acanthopores and plainer divisional lines between tlio adjacent zooecia- 
The main points of specific importance are to be fovtnd in the varying 
sizes of the zooecial apertures and in the form of the zoarium. Type 
specimens in the museum of the University of Nebraska, Lincoln, Nebr. 
Position and locality: Coal Measures, South Bend, Nebraska. 
Stenopora distans n. sp. 
PI. XX Figs. 3-5. 
Zoarium an expanded crust, consisting of a single layer of zooecia, 
supported by a wrinkled epitheca ; thickness 2 to 3 mm., width variable, 
average about 3 mm. ; surface spinulose when not worn, with low 
monticules, or smooth. Apertures subcircular, not in regular lines, un- 
equal in size, 0.25 mm. in diameter, fifteen or sixteen in 5 mm. Inter- 
spaces thick, with rounded surface, unequal in width, sometimes 0.15 
mm. or more wide. Zooecia 2 to 3 mm. long, quite straight throughout 
the entire length ; walls quite thick throughout the length of each tube, 
not plainly moniliform ; zooecial tubes subcircular in section, of vm- 
equal diameters, varying from 0.16 to 0.28 mm. Large acanthopores 
occur at some of the cell angles; acanthopores o.i to 0.12 mm. in 
diameter, of regular form, circular in section, slightly more than half 
as numerous as the zooecia ; small and less regular acanthopores, 0.03 
to 0.05 mm. in diameter, occur in the walls between the large acantho- 
pores; their number varies from about 10 to 15 surrounding each zo- 
oecium. Diaphragms thin, three to seven in each tube, irregularly dis- 
posed. Mesopores small, usually not more than 0.07 mm. in diameter, 
irregular in section, one-third to one-half as numerous as the zooecia. 
To a limited extent, this species resembles S. spinulosa Rogers, in 
having similar though less numerous large acanthopores which are not 
disposed as they are in that species. The wide interspaces and the 
varying sizes of the zooecia serve as the main specific characters. The 
diaphragms are also of use in separating it from related species. Type 
specimens in the museum of the University of Nebraska, Lincoln, Ne- 
braska. 
Position and locality : Coal Measures ; Louisville, Nebraska. 
Stenopora (?) polyspinOSa n. sp. {^Provisional.) 
PI. XX. Figs. 6-10. 
Zoarium ramose consisting of subcylindrical branches with di- 
ameters of 4 or 5 mm. Bifurcations far apart, with small angles. Sur- 
face smooth, except for numerous small and a few large acanthopores 
which project on the interspaces as low, blunt spines; the former give 
the surface a papillaceous appearance. Zooecial apertures subcircular, 
not arranged in series, 0.25 to 0.3 mm. in diameter, thirteen in five 
mm. Interspaces average 0.07 or 0.08 mm. wide. The zooecia ascend 
from the vertical axis of the branch, curve, and then pass in nearly 
a straight line to the cortical portion, where the walls thicken quicklv, 
