175 
Bryozoa from the Wandagee and Nooncanbah Series 
(Permian) of Western Australia. 
aiT straight, and are rounded on 
0-41 to 0-48 iniu. in width. The 
the eelluliferous surface; they are from 
Carina is broadly rounded and is ])oorly 
defined, and shows two rows of rather small nodes, which regularly alternate; 
each nod(‘ is placed lateral to a zooecial aperture; the distance between 
adjacent nodes is from 0 13 to 0-21 uim. The apertures are circular, 0-13 
mm. in diameter, and are ]>laced on the sloping sides of the branches: they 
may ])roj(*ct very slightly into the fenestrules ; the i^eristomes are very ])oorly 
defined. There are usually two ai>ertures in the length of each fenestrule, with 
an extra oiu* opposite each dissepiment; the distance between the centres of 
successiv(‘ a])('i'tu]‘es is al)out 0-35 mm., and twenty-eight apertures occur in 
10 mm. The fenestrules are oval, fi‘om 0-57 to 0-02 mm. in length, and 
about 0-2 mm. in width; the . Avidth of the dissepiments is from 0-32 to 
0-3G mm. On tlu^ eelluliferous surface the dissepiments are rounded, and 
are ('overed by a thick, finely granular deposit; they are not dejn’essed very 
much below the surface of the branches. On the reverse surface the branches 
and disse])iments are of the same thickness; both are evenly rounded; the 
outermost layer is finely granular. Bifurcation occurs at infre(|uent inteiA'als, 
and increase to three roAvs of zooeeia occurs immediately before branching. 
Remarks: This species differs from Fenestella jahipusi^ Waagen and 
l^ichl, from the Middle and Opper Productus Limestone of the 8’alt Ranges, 
in having fewer zooeeia to a fenestrule, and a less well defined keel, and in 
having the dissepinumts on the eelluliferous surface nearly level with the 
branches; and from Fenestella hinodata Condra in having feAA'er fenestrules 
in 10 mm., and much more widely spaced zooeeia. Minilya duvlaris s}). nov. 
is a finer form, and shows fewer zooeeia to a fenestrule. 
Geinis POLYPOEA McCoy. 
Polypora McCoy, 1845, Synopsis of the Carboniferous Limestone 
Fossils of Ireland, p. 207. 
Genoty]K‘ : Polypora dendroides McCoy, 1845. 
Jnfnndibuliform or flahellate Fenestrellinidae , ivith the zooeeia arranged 
in three or more rows on the hranclies, except just after bifurcation, ivhen 
ftnly two rows may he ]>resent ; nodes (acanthopores) usually present, hut 
carina not usually developed ; dissepiments not eelluliferous ; internal structure 
and reverse surface as in Fenestrellina. 
Polypora fovea sp. nov. 
IMate 3. Figs. 1, 3. 
Holotvpe; Sp(‘cimen 20047, Fniversitv of Western Australia Collection 
tColk A. Wade.) 
llorizoii and locality: Xooncanbah Series; Keevie’s Well, 8 miles north 
of lUt. Anderson Homestead. 
Polypora with four to five rows of zooeeia, and four to fire zooeeia to a 
fenestrule : nod.es small, infrequently developed ; branches and dissepiments 
narrow. 
There are 8 to 12 branches horizontally, and 0 to 6.5 fenestrules verti- 
cally, in 10 mm. The branches are straight and are relatively very narrow, 
being from about 0-45 mm. in Avidth where there are four, to as much as 
0-7 mm. Avhere there are five, roAvs of zooeeia; they usually show four to 
five rows of zooeeia, with three — less often tAvo — for one or tAvo fenestrules 
aft(*r, and five to six just before, branching. The apertures are sub-circular, 
