78 
our specimen, which is somewhat weathered), and is twice as long and 
broad as the plates in the Bowning specimen. The Victorian example 
came from the Silurian of Fraser’s or No. 3 Creek, Springfield, GeoL 
Surv. coll., Bb 25. 
Locality and Horizon .—Tyers River, Gippsland. Silurian (Yeringian). 
Class POLYZOA. 
Sub-Order Crypto stomata. 
Genus Rhombopora, Meek. 
Rhombopora. gippslandica, sp. nov. 
Plate II., fig. 4; pi. VII., fig. 15. 
Description .—Zoarium slender, branching; the branches cylindrical to 
subangulate. Diameter of branches 1 to 2 mm. Apertures arranged in 
vertical series, the rows variable in number, from 6 to 10; ovate, deeply 
excavate, and abrupt on lower edge, which generally carries a spine. 
Length of aperture .5 mm. ; width .3 mm. Space between rows of apertures 
occupied by a more or less elevated granulose ridge. Axial tube ap¬ 
parently present, thin and flexuous. Zooecial tubes at first slightly 
divergent, and then curving outward to the external surface. Hemisepta 
present, situated near the zooecial openings. 
Observations. — The above diagnosis is derived from casts in mud¬ 
stone occurring abundantly in the Silurian of Wombat Creek, Mitta Mitta 
River, and from several sections seen in the thin slices of limestone from 
Tyers River. 
In certain points the above species closely resembles Rhombopora ovati- 
pora , J. Hall spA, from the Lower Helderberg of New York State. The 
branches of R. gippslandica , however, are more than twice the diameter 
of Hall's species, and, whilst the latter has a fairly constant character in 
the five or six vertical rows! of apertures, R. gippslandica exhibits in the 
basal portions of the zoarium as many as ten. In R. rhombifera , Hall 
* sp.2 may be seen the character of variation In the diameter of the 
branches, but the apertures are not separated by the vertical ridges. 
The genus Rhombopora has apparently been hitherto recorded from 
Australia only from Carboniferous beds by Dr. G. J. Hinde, who described 
R . tenuis , from the Gascoyne River, Western Australia. 2 3 
Locality and Horizon .—Tyers River, Gippsland. Also in mudstone. 
Wombat Creek. Silurian (YVringian). 
List of Fossils mentioned in this Report - 
T ho ms on River. 
Name. 
Number of Specimen. 
Girvanella 
205, 65. 
(?) Alveolites 
205 
Fistulipora, sp, indet. 
207. 
Stromatoporoid, indet., ... 
205. 
Crinoid remains, indet. 
204-210. 
(?) Primitia 
207, 65 
1 Trematopora ( Orthopora) ovatipora, J. Hall, Pal. N. York, vol. ^ 1., 1887, p. 17, pi. XI. figs. 9 11; pi- 
2 Trematoporct ( Orthopora ) rhombifera , J. Hall, ibid., p. XVIII, pi. XI., figs. 15. 17-20; pi. XXIII., 
figs. 11, 12. 
3 Geol. Mag. Dec, III., vol. VII., p. 203, pi. VIIIa., figs. 4, 4a. 
