172 
Previous Determinations of Rushworth Fossils. 
In tlie Progress Report of the Geological Survey of Victoria,^ Sir F. McCoy 
gave a description of some fossils from Whroo, near Rushworth, in his 
“ Schedule of Reports on Fossil Specimens,” in which he says, “ Almost 
indeterminable casts in sandstone ; of these there are two articular surfaces 
of crinoid stems of the Actinocrinus type, one small coral, probably Favosites 
fibrosa, one indeterminable lamellibranch and two fragments of the Upper 
Silurian variety of Orthis calligramma. In regard to the age of the beds, 
as determined by McCoy, that author stated that “ The balance of the evidence 
is in favour of the rock being Upper Silurian.” The fossils examined by 
McCoy came from a sandstone range between Whroo and Coy’s Diggings. 
From the same locality (specimens in the National Museum) I have identified 
(?) Heliolites ; and from a range of 5 miles north-east of Redcastle there are 
indeterminate crinoid stems represented by siliceous casts .2 Lastly, amongst 
some fossils from Coy’s Diggings, Bailieston, received a short time ago from 
Mr. Thos. Smith, of Newstead, there occur species of the genera Spirifer 
and Palceoneilo, which bear a Yeringian aspect, although their exact specific 
determination is not possible. 
Condition of the Specimens. 
These fossil corals are, generally speaking, well preserved in their super¬ 
ficial aspect, and also occasionally structurally, but the structure, as is so often 
the case with silicified fossils, is only brought out by natural weathering. 
The preparation of a surface by grinding only tends to obliterate what could 
be previously seen, the effects of the abrasion and polishing merely emphasizing 
the granular structure of the quartz. That it is a true silicification or replace¬ 
ment of the calcareous skeleton of the coral is shown by the tendency of the 
original calicular cavities to weather out as in an ordinary fossil limestone 
coral. 
Description of Specimens. 
ANTHOZOA, Sub-class TETRACORALLA. 
Genus Streptelasma, J. Hall. 
Streptblasma sp. (Plate XIII., Figs. 1, 2). 
Description. —This is a cast of a small rugose coral which has a raised 
floor to the base of the cup. A mould taken in plasticene shows this elevated 
floor to be formed by the conjoined internal edges of the septa. The septa 
number about twenty, and are stout. Numerous minute dissepiments 
present in the outer zone. There is also a well-marked septal fossula. 
But 'for the presence of a septal fossula, this specimen would have found 
a more appropriate place in the genus Lindstroemia, since the septa are fewer 
than is usual in Streptelasma. The general form of the corallum, so far as 
can be seen from the cast, is a short cone with an everted calicular margin. 
Diameter of cast, 7'5 mm. 
' Genus Anisophyllum, Edwards and Haime.® 
Anisophyllum howitti, sp. nov. (Plates XIII., Fig. 3; XIV., Figs. 7, 8, 9). 
Description. —Corallum small, short, trochoid, and curved. Septa about 
twenty, alternating long and short; stout and slightly thicker towards the 
inner extremities. The longer septa in some cases meet, but do not fuse 
* Op. supra cit., p. 174. 
* For a map of this district see Prog. Rep., No. V., Geol. Surv. Viet., facing p. 153. 
* Milne, Edwards and J. Haime, Brit. Foss. Corals (Pal. Soc. Mon.), 1850, p. LXVI. M. Edwards, 
Hist. Nat. Coralliaires, 1860, Vol. III., p. 354. Nicholson and Lydekker, Manual of Palaeontology, 1889, 
Vol. I., p. 296, fig. 175. 
