Foerste.] 
332 
[May 1, 
of the frond and the number and arrangement of its cells indi- 
cate some species of Phaenopora , but the interstitial cells of that 
genus were not seen. This, however, is not surprising since the 
sandstone would scarcely preserve such delicate features. 
It is scarcely worth wdiile to describe such specimens except in 
order to show what class of bryozoa exists in these localities. 
Rhinopora verrucosa, Hall. 
Specimens of the following description were found at Cumber- 
land Gap, Tennessee. Fronds thin and flat, only one face seen in 
any of the specimens as preserved in the ferruginous sandstone. 
The cell apertures raised into low monticules, which are distant 
from one another for a distance equal to or slightly exceeding their 
own diameter. The average number of cells in a length of 3 mm. 
is six. On different parts of the same frond the number of cells 
in 3 mm. frequently fall to five and a half and rise to six and a 
fourth ; they may even fall to five and rise to six and a half, but 
these limits do not seem to be exceeded in this locality. The 
cells are arranged in diagonal rows. It is not possible to say 
whether these specimens are further ornamented by branching fur- 
rows or ridges, or monticules. Some fronds, and even these are 
fragments, show a length of 50 mm. and a width of 30 mm. 
Similar specimens are found at Collinsville, Alabama. From 
five and one-half to six cells are found in a length of 3 mm. 
In Ohio, this species has usually a somewhat greater number of 
cells in the same length, varying from six to seven and one-fifth 
cells in 3 mm. 
At Hanover, Indiana, the fronds usually remain attached by 
their cellular sides to the rock, and only the epithecal layer is ex- 
posed. The cells can usually, however, be seen through this layer, 
the limestone being sometimes translucent, and sometimes the epi- 
thecal layer is slightly worn away. 
This species was originally described from the Clinton Group 
of New York. We suspect that most specimens of Lichenalia 
concentrica identified from the Clinton of Ohio, will prove on fur- 
ther examination to be the epithecal exposures of Rhinopora 
verrucosa. 
Heliolites subtubulatus, McCoy. 
This species is found in considerable abundance at Ludlow Falls, 
