170 
JOAX M. Crockford. 
Feiiestrelliuil with three to four zooecia to a feuestrulej very broad 
bra'nches ; rounded carina with small nodes. 
There are 10 branches horizontally, and 10 fenestrules vertically, in 
10 imii. The branches are very broad, from 0-03 to 0-75 mm. in width, and 
show a median, rounded, relatively low carina, with rather small, rounded 
nodes, placed from 0-24 to 0-4 mm. apart. The apertures are circular, 
0 13 mm. in diameter, and are placed on the tlattened sides of the branches; 
no peristomes are shown. From three to four apertures occur in the length 
of one fenestrule and one dissepiment; th(‘ distance between the centres of 
successive ai)ertures is from 0-29 to 0-35 mm., and about 33 apertures 
occur in 10 mm. The fenestrules are oval, from 0-52 to 0-68 mm. in 
length, and from 0-3(i to 0-44 mm. in width; the width of the dissepiments 
is from 0-4 to 0-48 mm. A cast of the reverse surface shows that both 
branches and dissepiments are evenly rounded, and that they are of the 
same thickness (about 0-4 mm.). On tlu‘ c(41uliferous surface the dissepi- 
ments show numerous tine transverse striae Avhen they are very slightly 
weathered. 
Kemarks: The broad, tlattened branches and dissepiments distinguish 
this form from associated species. 
Fenestrellina columnaris sp. nov. 
Plate 2, Fig. 3; Text-figure 1 F, G. 
Holotype; S[>ecimen 20949, I’niversity of Western Australia Collection. 
(Coll. C. Teichert and H. Coley.) 
Horizon and locality: Lower half of the Calceolis))ongia Stage of the 
Wandagee Series; Syncline on Minilya H., mile West of Coolkilya Pool. 
Fenestrellina with three zooeeda to a fenestrule; carina slight, nodes large 
ayid very high. 
The colony Avas probably infundibuliform ; the holotype is a large, very 
much folded expansion. There are 10 l)ranches horizontally, and from 14 
to 15 fenestrules vertically, in 10 mm. The branches are straight, from 
0-33 to 0-38 mm. i!i Avidth, and shoAv a slight median carina, Avhich bears 
a single roAv of high nodes, placed from 0-33 to 0-4 mm. ainirt. These nodes 
are slightly elojigated along th(‘ carina at their bases, but above this they 
are rounded in cross section, and terminate bluntly; their height is up to 
0-17 mm., and their diameter at the top may be as much as 0-2 mm., though 
it is generally less. The apertures are circular, 0-13 mm. in diameter, and 
are placed on the sloping sides of the branches, but do not project into the 
fenestrules; }>eristomes are not developed. Three apertures occur in the 
length of each fenestrule, and one of these may be placed opposite the end 
of a dis.sepiment ; the distance between the centres of successive apertures 
is from 0-25 to 0-29 mm., and about thirty-seven apertures occur in 10 mm. 
Bifurcation of the l)ranches may occur Avithin 5 mm. ; increase to three i‘ows 
of zooecia occurs immediately before branching. The fenestrules are oval, 
from 0-44 to 0-5 mm. in length, and about 0-25 mm. in Avidth ; the Avidth 
of the dissepinu'iits is from 0-22 to 0-3 mm. On the reverse surface both 
branches and dissepiments are evenly rounded, although after .slight Aveather- 
ing they appear angular; the dissepiments are as thick as the branches — 
about 0-75 mm.; the outermost layer of the revers(‘ surface is finely granular. 
Rootlets, which are often forked, and are up to about 8 mm. in length, may 
])e developed from the reverse surface. 
