NOTES AM) EXHIBITS. 467 



Rev. J. M. Curran exhibited a specimen of a typical trachyte 

 from Coonabarabran, with a photograph of the locality ; also a 

 specimen of blue sapphire in a matrix of basalt from New England, 

 the first record of the matrix for sapphire in Australia. A 

 section of the matrix was shown under the microscope. 



Mr. Froggatt exhibited specimens of the moths mentioned in 

 his paper; a section of the stem of an Acacia attacked ))y 

 Eudoxyla eucalypti ; the felted bags formed by the larger variety 

 of this species, and the wads formed by Leto Stacyi. 



Dr. Cox showed a beautiful specimen of a lamellibranch 

 (Mactra), obtained by Mr. Massie at the White Cliffs, near 

 Wilcannia, the calcareous matter of the valves of which had been 

 partly replaced by precious opal. He also exhibited an elaborately 

 ornamented specimen of a form of boomerang club, one of several 

 he had recently seen, procured from the Pitchery country, to the 

 north or north-east of Bourke, in Queensland. Associated with 

 this weapon, received by Mr. Rankin from a squatter, were some 

 dozen or more fine boomerangs, all of them elaborately ornamented 

 with carvings, and three wooden spears, about 18 feet or more 

 long, each made from a single piece of wood, evidently for use 

 without a womerah ; these likewise are ornamented from end to 

 end with longitudinal carving as if in imitation of a climbing 

 plant. There were also three fine shields. 



Professor David exhibited some specimens of the Silurian 

 coral Mucophyllum from the Yass District, with numerous small 

 siliceous fossils, probably siliceous sponges, attached chiefly to the 

 undersurface of the coral. The siliceous skeleton as seen undel- 

 the microscope is minutely spicular. In most of the specimens 

 the original organic structure of the silica has been obliterated 

 through the alteration of the silica into the chalcedonic variety 

 of quartz, beekite. 



