82 
BULLETIN OF THE LABORATORIES 
or terminate near the middle. Where this arrangement prevails the 
peristomes of neighboring apertures coalesce and form what may be 
termed beaded ridges. In these transverse rows five apertures occur 
in 2 mm. and from six to eight suffice to cross the branch ; measuring 
longitudinally, eight or nine rows occur in 5 mm. In other examples, 
an arrangement in fairly regular longitudinal and diagonally intersect- 
ing series is evident. In these, nine apertures occur in 5 mm. length- 
wise, and six in 5 mm. diagonally. In all the diameter of the aper- 
tures situated near the bordets is a little greater than that of those near 
the center of a branch. Sub-centrally perforated opercular covers 
close many of the zooecia orifices on the specimen illustrated on Plate 
XIII. Interspaces smooth or very finely granulo-striate. 
The position of this species is intermediate between C. occelata^ 
Ulrich, and the Coal Measure species C. carbonaria^ Meek. 
Formation and locality : — Waverly group at Moot’s Run, Licking 
Co., Ohio, about 200 feet below the top of the series. Also in the 
Keokuk group at Warsaw, 111 ., and Keokuk, Iowa. 
CYSTODICTYA ANGUSTA, sp. u. 
Plate XIV, Fig. 20. 
Of this species I have seen only small fragments of which the 
largest is figured. None of them show any indication of having been 
branched. The basal portion is preserved on one of them. This 
grew around some slender foreign object, is comparatively large, and 
exhibits irregularly distributed apertures of a number of zooecia. 
From one side there arises a free branch like the fragment illustrated. 
The latter presents the following characters: It is between 0.8 and 
0.9 mm. wide, 0.5 mm. thick, sub-elliptical in cross section, curved, 
with the margins narrowly rounded and granulo-striate. The surface 
presented to view has two rows of zooecia apertures, with twelve in 
each row in 5 mm. By removing a portion from the matrix it has 
been ascertained that the opposite side bears three rov/s. The zooe- 
cia apertures are subcircular, rather large, about 0.18 mm. in diame- 
ter and surrounded by slightly elevated thick peristomes. The sur- 
face between the rows of apertures is rounded or sub-angular and pre- 
sents several interrupted sinuous strire or series of granules. The lon- 
gitudinal spaces between the zooecia apertures is transversed by one 
