ORDOVICIAN FAUNAS. 143 
hh] 
The zocecia are at first nearly parallel with the axis of the branches, 
but finally curve outward somewhat abruptly, so that theiz outer 
portion is at nearly right angles to the axis. Diaphragms are present 
abundantly in some species, but more rarely in others. 
PHYLLOPORINA,; FENESTRATA: (Hall). 
Plate VII., Fig. 6. 
1850. hétepora fenestrata Hall, 3d Rep. N. Y. State Cab. Nat. 
Hist., p. 170, pl. 2, figs. 1 a—e. 
Description.—Zoarium a reticulate expansion, with the branches 
irregularly anastomosing or united by transverse bars. The branches 
cylindrical, celluliferous on but one side, the obverse side marked 
by fine, raised, angular striz, whose general direction is longitudinal, 
but which, also, have transverse branches, which give to them an 
irregular, reticulate arrangement. 
The diameter of the branches is 0.3 or 0.4 mm., the transverse bars 
being somewhat smaller; the spaces between the branches are 1 min. 
or less. 
Remarks.—This species has been recognized only in the lower por- 
tion of the Trenton limestone, in strata which are probably of Black 
River age. The celluliferous surface has in no case been observed 
on the New Jersey specimens. Hall’s original illustration of the 
species shows the cells to be triangular or quadrangular in outline 
and arranged irregularly, from four to six occupying the entire width 
of each branch. The species can be distinguished from other members 
of the genus by its definite, transverse bars joining the branches of 
the zoaria, which, in Hall’s figures, are shown to be non-cell-bearing. 
RHINIDICTYA sp. undet. 
Plate VIII., Figs. 7-9. 
One or more species of Fhinidictya occur in the Trenton limestone 
of New Jersey, but the material is usually in too imperfect a condi- 
tion to be satisfactory for study. Some of the specimens seem to 
