178 
Joan .M. Ckockfohd. 
inni. where thev(* are rows of zooeeia ; the width increases rather raiddly 
before branching', which occurs at relatively short intervals. Small nodes 
were appaiamtly rather abundant, though they arc; now frequently weathered 
away; generally not more than two occur adjacent to each zooecial apertuia . 
The whole of the celluliferous surface is hnely tuberculate; the dissepiments 
>how numerous tine transverse striae where they are slightly worn. There 
are usually Hve to six I'ows of zooecial ai)crtures, with from six to seven 
before, and from three to tour after, branching; tin* apertures ai*e cii’culai*. 
about 0.16 mm. in diamet(‘r; no peristomes are shown: the distance betweeii 
the centres of successive ai)ertures is i'rom 0-J8 to 0-40 mm., and about 
twenty-two apertures occur in 10 mm. with from six t<> fourteen o])posite 
each fenestrule. The fenestrules are fi'om 2 \ to o (i mm. in length, and 
from 0*65 to 11 mm. in width; the dissepiimaits, whi(-h are not celluli- 
ferous, are from 0-46 to 0-6 mm. in width. The re\'erse surface is mtt 
shown. The cells are short and are rhomboidal in shape; they are from 
0 J2 to 0-38 mm. in length, and are about 0-24 mm. iii w’idth at their widest 
part; the extremities of successive cells in the same row are not in conta<d. 
Xo surface cells are developed. 
Hemarks: The rather numerous small nodes, tin* absence' (d' any 
rounded sui’face cells, and the short, broad zooeeia separate this species 
from Pohf })()}'(( nKignufeucsfrafa Crockfoi'd, from the Lower and I pi)fu 
Marine Series of Xew Soutli Wales. 
Folypcra s]). nov. indet. 
Plate 2, tig. 5. 
Horizon and locality: Xooiicanbah Series; scarp two miles Last of 
Christmas (’k. Homestead. (Specimen 200o2 a, Lniversity of ^^estern Aus- 
tralia Collection; Coll. A. Made). 
Polypora tcith about eight roivs of iooeci((, and tnfh from jiiih' b* 
fiftreu apertures to a feucMruJe; nodes not developed. 
The specimen is a I'ather weathered cast of the cellulii erous s\irlaee. 
and the form of the colony is not well shown, though it was pi'o})ably in- 
fundibuliform, with the celluliferous surface internal. Tlnere are from 3 
to 4 branches horizontally, and from 1 o to 2 fenc'^tniles vertically, in 
JO mm. The branches bifui-cate at relatively very fretiuent intervals, gener- 
ally less than the length of one fenestrule apart ; they ai'e usually from 
J-2 to l-7)5 mm. in width, but broaden considerably just before bifurcation. 
There are normally about seven or eight rows of zooecial apertures; thc- 
branches are thick and very convex, and the latei'al rows of apertures open 
towards the fenestrules. The apertures are circular, about 0-14 mm. in dia- 
meter, and the distance betAveen the centres of successive apertures is about 
0-49 to 0-6 nmi.; the number of zooeeia in the length of one fenestrule 
and one dissepiment A’aries with the length of the fenestrules fi'om about 
9 to 15. Xo nodes are shown. The fenestrules are oval, from 3-3 to 6-9 mm. 
in length, and from 0-86 to 1-41 mm. in width at their widest ]>art; the dis- 
sepiments, which ex})and considerably at their junction Avith the branches, are 
from 1-2 to 1-6 mm. in Avidth ; they are not celluliferous. The i-cA erse surface 
is not shoAvn. 
Remarks: This species most closely resembles Polifjiora yigantea M aagen 
and Pichl, from the Middle Productus Limestone of the Salt Range, but is. 
distinguished by its narrower fenestrules and broader dissepiments, and by 
its much more frequent bifurcations. 
