352 The American Geologist. December, 190::. 
narrowly or slowly rounded, sides facing the fenestrules flattened, 
surface covered with granules 0.05 mm. across ; a few circular acces- 
sory pores are present on this face ; pores placed ne'ar the ends of the 
dissepiments, sometimes scattered over the surface, 0.14 mm. in diam- 
eter; branches close, average 0.7 to 0.8 mm. wide, 0.9 mm. just be- 
low a bifurcation, five in 5 mm. ; obverse face quickly rounded, with 
large nodes along the center which cause it to appear thin ; nodes read- 
ily observed by the unaided eye, irregular in form and size, 0.15 mm. 
wide by 0.3 mm. long at their bases, elevated, 0.4 to 0.5 nun. apart 
from apex to apex, in one regular row in young specimens, or in ir- 
regular rows in old forms. 
Dissepiments on the reverse, short, granulose ; much depressed and 
thinner on the opposite face. Fenestrules of the reverse, elliptical, 0-9 
mm. lo.Tg by 0.5 mm. wide, smaller deeper in the frond ; on the ob- 
verse face, less regular, longer, narrower, i. to i.i mm. long by 0.3 
to 0.4 mm. wide, four in 5 mm. 
Zooecia in four or five, sometimes six, alternating ranges. Aper- 
tures subcircular, 0.9 to o.ii mm. across, one to one and one-half di- 
ameters apart ; lateral ranges have thin peristomes ; the middle 
ranges are quite obscured by the large nodes while the lateral ranges 
are not easily seen on account of the depth and the flattened surface. 
No Coal Measure species has tjie apertures more obscured ; sixteen 
occur in 5 mm., with four in each range to the fenestrule. 
This species is related to F. ulriclii n. sp., but is less robust and 
structurally diflferent. The accessory pores of the reverse face serve 
as the basis for the name. Type specimens in the museum of the 
University of Nebraska,. Lincoln, Nebraska. 
Positicn and locality: Coal Measures; Table Rock, Nebra:-ka. The 
first specimen of the species was collected by Mr. H. H- Moore, 1900. 
Polypora ulrichi /;. sp. 
PI. XXIII. Figs. 6-10. 
Zoarium a reticulate expansion of large size ; branches on the re- 
verse, stout, rigid, rounded ; sides facing the fenestrules rounded or 
flattened, granulose; granules in faint lines. Branches average 0.9 
mm. in width, 1.25 mm. just below and 0.75 to 0.8 mm. immediately 
above a bifurcation, six to eight in i cm. ; obverse subcarinate, especial- 
ly in young unworn specimens, with a row of large cylindrical nodes 
along the middle of the branch, nodes usually in a straight line, 0.5 
to 0. 7 mm. apart, 0.15 to 0-21 mm. in diameter, with blunt apices, larg- 
er and less regularly disposed in old forms. 
■ Dissepiments depressed, subcarinate, thin and short on the obverse ; 
larger, some wider, not much and sometimes not at all depressed, 
stout, one-third to two-thirds as wide as the branches, expanded term- 
inally, and faintly granulose on the reverse. 
Fenestrules on the reverse, subelliptical, 1.15 to 1.38 mm. long by 
0.4 to 0.5 mm. wide, six to seven in l cm., not quite so long on the 
reverse. Zooecia quite large, in four to seven alternating ranges, us- 
