Foerste.] 
330 
[May 1, 
number of cell rows varies from five and four-fifths as the usual 
number to four and four-fifths as a rare occurrence. The non-cel- 
luliferous margin is usually quite narrow. The cells are arranged 
in longitudinal and in diagonally-crossing rows. Their form is 
oval, often broadly oval. Although this form is chiefly to be dis- 
tinguished from Ptilodictya famelicus by the greater size of its cells, 
the fact that owing to the greater width of the cells the longitudi- 
nal lines separating the cell rows are not quite so distinctly 
straight lines, especially when examined with a low-power lens, is 
of some value, This species also occurs in the cementing material 
of the Clinton conglomerate at Belfast, Highland County, Ohio. 
Stictopora similis, Hall. 
In the cementing material of the conglomerate at Belfast, High- 
land county, Ohio, a single specimen of the following description 
was found. Fragment of a frond 8 mm. long, once dichotomously 
branched ; the branches 3 mm. broad. The branches moderately 
convex from side to side ; their thickness, the character of their 
edges, whether celluliferous or not, could not be determined. 
About nine or'ten rows of cells occupy the branches, horizontally, 
having at the same time a diagonal arrangement. About five cells 
occupy a length of 2 mm. The mouths of the cells are surrounded 
by a raised border or lip ; cell apertures are oval in form, and 
are separated from each other by distances varying from one-fourth 
to almost three- fourths their diameter in different parts of the frond ; 
normally, perhaps, one-third their diameter. Direct comparisons 
with Stictopora similis , as originally described from the Niagara of 
Indiana, have not been made, but the published description and 
figures of the latter, render the identification of the Ohio Clinton 
form quite safe. 
Phasnopora fimbriata, James. 
In the cementing material of the conglomerate at Belfast, High- 
land county, Ohio, numerous fragments of a narrow form of Phcen- 
opora occur in considerable abundance. These almost uniformly 
show the exterior surface. The specimens are usually 2.5 mm. 
wide ; one of them is 14 mm. long ; none of them are branched- 
Eight or eight and a half cells occupy a length of 2 mm., and ten 
cells occupy the same distance in width. The cells are arranged in 
longitudinal rows, there being two interstitial cells, one on either 
