OF DENISON UNIVERSITY. 
79 
far seen; the larger kind are slightly narrower than the main stems, 
about 1-9 mm. wide, and are longer than the branches just described, 
the length of the largest branch so far seen being 4 mm ; at a short 
distance from the main stem these also bear very short minute branch- 
es. Along the stem the branches are stationed with some regularity, 
about 4 branches in a length of 2 mm ; three to four small sized 
branches intervene between those of larger size when the latter occur. 
At a distance of 1.6 mm. from the stem along one of the branches 
the minute branches mentioned above begin ; these are stationed also 
at equal distances apart, almost 5 in a length of 2 mm. The cell ap- 
ertures are distinctly elevated above the surface of the stems and cause 
irregularity in the surface. There is always a cell at each juncture of 
a branch with the stem, near the smaller angle; and also one half way 
between the successive branches along the stem. Since the alternation 
of the cells is regular, the branches are therefore not strictly opposite, 
although at first sight they may appear so. 'The presence and arrange- 
ment of cells on stems and branches is similar, excepting that on the 
smaller branches they are stationed closer together, as might be ex- 
pected. Five to seven longitudinal wavy striae mark the poriferous 
side ; two of these, somewhat more prominent and almost continuous, 
though variable in distinctness, form a sort of median keel between the 
cell rows. An equal number of striae mark the non-poriferous side ; 
these are quite straight and are covered with numerous minute gran- 
ules, scattered, or apparently forming three or four rows along the 
stri^. 
Glauconome trilineata, Meek, is readily distinguished by its larger 
size, flattened stems and branches, and a median trilineate ridge on 
the poriferous side which is very characteristic. Gl. nereidis, White, 
differs in its larger size, the comparatively small space between the 
branches, and in the presence of dimorphous pores upon the poriferous 
side on the convex area between the regular cells. 
Moderately common at Flint Ridge. Named in honor of the U. S. 
Paleontologist, Dr. A. C. White, through whose courtesy I was per- 
mitted free access to the valuable collections in the United States Na- 
tional Museum at Washington. 
Genus SEPTOPORA, Prout. 
Zoaria fenestrated by the union of the short lateral branches of 
adjacent stems ; cell rows, two ; dimorphic pores present. Synocladia, 
