A EEVISION OF SOME PREVIOUSLY DESCRIBED SpECIES OF BrYOZOA 189 
FROM THE Upper Palaeozoic of Western Australia. 
by the lectotype, though they fall within the range of variation of it ; they 
are weathered so that the nodes are not visible, but appear to be conspecific 
with the lectotype. 
Fcnestrellina affiue)isa is distinguished from associated species by its 
thick branches, and large, well spaced nodes. 
Fenestrellina horologia (Bretnall). 
(Plate T., fig. .] ; Plate II., fig. A.) 
Fe-nesfella horologia Bretnall, 1926, W.A. Geol. Surv&y, Bull. 88, p. 15, 
pi. I., fig. 6. 
[non] Feyiestella horologia Bretnall, Hosking, 1931, Joui\ Roy. Soc, W.A., 
Vol. XVII., p. 13, pi. IV., fig. 3. 
Fenestrellina horologia (Bretnall), Crockford, 1944, Jour. Roy, Soc. W.A., 
Vol. XXVIII., p. 167, pi. I., figs. 3, 6. 
Fenestella parviuscula Bassler, 1929, Paldontologie von Timor, Lief. XVI., 
XXVIII., p. 76, pi. 17 (CCXLI.), figs. 8-13. 
Fenestella parviuscula Bassler, Martin, 1931, Ue Palaeontologie en 
Stratigraphie van Nederlandsch Oost-Indie, Bryozoa, p. 391. 
Fenestella parviuscula Bassler, Fritz, 1932, Roy. Soc. Canada, Trans- 
actions, Third Series, Vol. XXVI., Sect. IV., p. 99. 
Fenestrellina parviuscula (Bassler), Elias, 1937, Jour. Paleontology. Vol. 
11, No. 4, p. 314. 
Neotype (? Lectotype); Specimen 2/2405C, Western Australian Geo- 
logical Survey Collection ; on specimen figured by Bretnall, 1926, pi. III. 
Horizon and locality : Between the top of the Lyons Series and the top 
of the Byro Series, Gascoyne River District, W.A. 
Fenestrellina with two zooecia to a fenestrule ; cariyia low ; nodes sharp, 
relatively high, about two to a fenestrule ; fenesfrules hoyir-glass shaped. 
The foi’m of the colony is not shown ; there are about 18 branches hori- 
zontally, and from 16 to 18 fenestmles vertically, in 10 mm. The branches 
arc straight, from 0-31 to 0*37 mm. in w'idth, and show two rows of regularly 
alternating zooecial apertures, separated by a slight median carina. Bifurca- 
tion occurs at rather distant intervals, and increase to three rows of zooecia 
occurs just before branching. The apertures are circular, from 0*08 to O-l 
mm. in diameter, and are placed on the slightly sloping sides of the branches ; 
the peristomes are not well shown. The apertures are generally very regularly 
placed, with one opposite the centre of each fenestrule and one at the end 
of each dissepiment ; the former project into the fenestrules — though the 
apertures open upwards and not into the fenestrules — and give them their 
characteristic hour-glass shape. The distance between the centres of succes- 
sive apertures is from 0*24 to 0*3 mm., and about thirty-seven occur in 10 
mm. The nodes are small and sharp, and arc placed in a single row on the 
carina ; they are from 0*24 to 0-3 mm. apart. The fenestrules are from 0*32 
to 0-51 mm. in length, and from 0*22 to 0-33 mm. — generally about 0*25 
mm.— in width ; the dissepiments are from 0-11 to 0* ] 7 mm. in -width. The 
reverse surface is not shown. 
