BY W. X. BENSON^ W. S. DUX, AXD W. li. BEOWXE. 3(55 



1. Yellow Kock Limestone, Upper Muswe'l Creek, Muswell Brook, N.S. 



Wales; ])robably of Carboniferous age. (*?) 



2. Manning- Kiver N.S. Wales, containing Foraminifera and of similar 



geological age. ( "? ) 



3. Bingara, N.S. Wales. Of Lower Carboniferous age.* 



4. Rocky Creek, Horton River, N.S. Wales * 



5. Mount Siluria, 4 miles S.W. of Gracemere, W. of Rockhampton, Queens- 



land. 



6. Co. Murehison, Parish of Horton, N.S. Wales.* 



7. Co. MmThison, Parish of Pallal. {Girvanella.)* 



8. Torryourn, Paterson, N.S. Wales*. 



9. Yass District, N.S. Wales. Upper Silurian. 



The present specimens closely resemble the Stanwell Oolites. 



Occurrence. — Lower Carboniferous Limestone. Parish of Babbinboon, N.S. 

 Wales. 



Note. — Many of the oolite granules sliow the presence of dolomite crystals, 

 probably due to metasomatism, and perhaps the result of a slight deformation of 

 the rock. The result of rock movements within the mass is seen also in the par- 

 tial solution of the granules where the surfaces under greatest pressure have 

 dissolved or become etched ; whilst others have been faulted and re-cemented. 



The matrix of these oolites is now chiefly calcitic. All the grains are fairly 

 evenly spaced, a fact probably due to the simultaneous and radial crystallization 

 of the original aragonitic deposit. 



ANTHOZOA. 



Sub-Order Tabulata. 



Genus Chaetetes Fischer. 



Chaetetes spinuliferus, sp. nov. (Plate xxiv., tigs. 1, 2.) 



Description. — Corallum, massive, growing on a base of stony or argillaceous 

 material and expanding over an irregular area. 



Corallites tubular, polygonal, more generally pentagonal or tetragonal, oc- 

 casionally hexagonal, and sometimes with one wall incurved, indicating division by 

 fission; multiplying by division at frequent intervals, radiating and strongly 

 cur\'ed; walls fairly thick and imperforate, with spinules resembling those seen 

 in Alveolites. Tabulae numerous, not very regular, thin, occasionally incomplete. 

 Diameter of corallites averaging about 1 mm. Longest diameter of corallites 

 (worn and incomplete), 8 cm. 



Relationships. — The strongly-curved corallites with their short spinules, best 

 seen in longitudinal section, at first sight recall Alveolites. The calicular orifices, 

 liowever, are polygonal and not lunate, and the walls are not perforated. It is a 

 true tabulate coral since the tubes are all of one kind and do not show imperfect 

 fusion of the walls as in the Montieuliporoids. 



There is an interesting species, formerly described as Chaetetes petropoli- 

 tanus by Lonsdale, from the Ordovieian of Russia, t which (in its thin-walled cor- 

 allites and irregularly contracted tubes resembles the above species; it differs, 

 however, in having no spinous projections on the corallite walls. The transverse 



•These limestones are in the Burindi formation W.N.B. 



tMurchison, Geol. of Russia (Corals by Lonsdale), Vol. i., 1845, p. 596, PI. A, figs.lO, 

 10<(. 



