185 
It is an abundant and fairly well-distributed fossil in the New South 
Wales Silurian, occurring at Hatton’s Corner and Derrengullen Creek in the 
Yass District ; and near Orange in parish Barton, county 
Ashburnham. 
Fam. Cystiphyllid^. 
Genus Rhizophyllum, Lindstrbm. 
Rhizophyllum enorme, Etheridge fil. (Plate XX., Fig. 11). 
Rhizophyllum enorme, Etheridge, jun., 1903, Bee. GeoL Surv. N. S. 
Wales, vol. VII., p. 232, pi. XLVII. 
Observations. —'This peculiar rugose and operculate coral is here noted 
for the first time in Victoria. The specimen from Cowombat Creek is less 
than normal size, measuring somewhat over 4 c.m in length, against Mr. 
Etheridge’s specimens which measured 6 and 7 cm. respectively. The present 
example, however, may easily have been larger when complete, as both the 
apex and the outer rim have been eroded. The epitheca is strong and trans¬ 
versely corrugated. 
In some respects the present coral resembles Shearsby’s R. rohustum} 
but the latter is of shorter conoidal form and the vesicular inner structure 
much finer. In the section of the Victorian coral the vesicular structure 
of the wall passes into tabulate structure as it enters the basal area of the cup. 
Occurrence. —Cowombat Creek, N.E. Gippsland, Silurian (Yeringian). 
In grey limestone. Nos. 2140 and 2141. 
The locality in New South Wales given by Mr. Etheridge is Boree Creek, 
portion 3, parish Cudal, county Ashburnham. 
Fam. HELIOLITID^. 
Genus Heliolites, Dana. 
Heliolites interstincta, var. gippslandica, Chapman (Plates XXIX., Figs. 30, 31 ; 
XXX., Figs. 32, 33). 
Heliolites interstincta, L. sp., var. gippslandica, Chapman, 1914, Rec. 
Geol. Surv. Viet., vol. III., pt. 3, p. 311, pi. LX., figs. 35, 36. 
Observations. —The corallum of this variety attains a large size. It is a 
prominent component of the Yeringian coral fauna of Victoria, and has 
lately been recorded by the writer from Rushworth (see preceding report). 
At the latter locality the coralla were much smaller than usual, and tending 
to take a mushroom shape, probably through adverse hydrographic conditions. 
The species itself occurs at Native Dog Creek in presumably Silurian mud¬ 
stones. 
Occurrence. —In fossiliferous limestone at Cowombat Creek, and in dark 
olive-brown mudstone on the Gibbo River at Benambra. 
Genus Plasmopora, Edwards and Haime. 
Plasmopora australis, Etheridge fil. (Plate XXVIII., Fig. 28). 
Plasmopora australis, Etheridge, jun., 1899, Geol. Surv. Viet., Prog 
Rep. No. XL, p. 33, pi. A, fig. 11 ; pi. B, figs. 5, 6. 
Observations. —The present specimen was found in the Limestone Creek 
area, whilst Mr. Etheridge’s example occurred not very far ofi, at Wombat 
Creek, and in limestone of precisely the same age. The corallum in our 
specimen bears out Etheridge’s suggestion that the form was hemispherical. 
It measures only about 9 mm., as against that of IJ inches in the Wombat 
Creek specimen ; but this difierence may be explained on the supposition 
that the section in the former case was taken through the basal area. The 
autopores in the present specimen measure slightly under 1 mm. in diameter. 
Occurrence. —In grey limestone. Native Dog Creek. (No. 2087.) 
^ Geol. Mag., Dec. V., vol. III., 1906, p. 548, pi. XXVI., figs. 1-6. 
