15 
Gemis — STEylATOPORA, Hall. 
Steiatopora atjstealica, L. G. de Koninck. 
PL I, fig. 33a. 
This little coral lias the form of a small cylindrical branch bifurcating 
towards the middle, hut one of the two accessory branches has been broken 
off ; the surface is ornamented with little granulations, scarcely visible to the 
naked eye; it is also penetrated by some number of sub-oval openings 
corresponding to tubes directed obliquely from above downwards tov^ards the 
centre of the coral ; these openings, comparatively large, are arranged in 
quincunx over the whole surface of the coral ; each is surrounded by a, small, 
circumscribed, smooth space, except at the lower portion, where it is narrowed. 
The diameter is only two millimetres; that of the openings, which may be con- 
sidered the calices, is only half a millimetre. I have not seen any septa. 
Belatlons ami Differences. — This species has some resemblance to 
Striatoporaflexuosa, J. HalT ; it differs from it in the granulated surface and 
the absence of septa in the calices. 
Horizon and Localltij. — A single specimen of this interesting species 
was collected from a dark grey limestone near Yass, on the banks of the 
Murrumbidgee. 
Genus — PAY OSITES, Lamarck. 
1. Pavosites cristata, Blmnenhacli. 
Madreporites crislatus, Blumenbacli, 1803, Comment. Soc. Sclent. Gott., XV, p. 151, pi. 
3, fig. 12. 
Calamopora polymorpha, Lonsdale, 1839, in Murchison’s Silurian System, p. 084, pi. 15, fig. 1. 
Favosites cristata, Milne Edwards and J. Haime, 1850, Polyp. Loss. Terr. Pal., p. 242. 
„ ,, Idem, 1852, Mon. Brit. Eoss. Corals, p. 260, pi. 61, £. 3 and 4. 
„ ,, Salter, 1858, in Murchison’s Siluria, p. 533, pi. 40, fig. 2. 
Coral usually composed of several more or less remote cylindrical 
branches having a diameter of six to eight millimetres. Calices slightly 
unequal, subcircular, a little oblique. This arrangement is due to the oblique 
disposition of the corallites grouped round the axis of the branches. 
Horizon and Localities . — This species, which has often been confused 
with. F. polymorpha, is found in the Silurian of England, Ireland, 
Gothland, and Russia. Mr. Clarke has found only one specimen in tlie 
quartzite of Burrawang. 
1 Palasontology of New York, ii, p. 156, pi. 40B, fig. 1. 
