decimeofitahi, S. cf. respertilio, S. cf. Clarke i, Dislasma, 

 Aviculopeotcn cf. wfitunmUfevus, Deltopecten ,suh<jniii<in<- 

 lineatus, Chcenomya (?). These specimens will be referred 

 to in ttie forthcoming "Mineral Resources — Tin," by Mr. 

 J. E. Carne. 



Mr. W. S. Dun also exhibited a specimen of Fenestella 

 fosstda from near Mount Baring, at the head of the Logan 

 River, near the New South Wales-Queensland Border, 

 demonstrating the Permo-Carboniferous age of the strata. 

 The specimen was forwarded by Mr. A. Wearne of Ipswich. 



Mr. W. N. Benson exhibited a collection of vesuvianite 

 and garnet-bearing limestones altered by intrusion of 

 granite (collected by Mr. D. A. Porter, near Tamworth). 

 A green-garnet vesuvianite rock from the Severn River 

 near Ballandean, Queensland ; a bastite rock from Bowling 

 Alley Point, showing poikilitic inclusion of serpentinised 

 olivine crystals in the bastate plates ; a shonkinitic nephel- 

 inite, and melilite basalt from Shannon Tier, Tasmania, 

 presented by Mr. W. H. Twelvetrees ; two microphoto- 

 graphs of pleonaste bearing gabbroid rocks included in the 

 basalt of Dundas ; one of these showed a remarkable grano- 

 phyric iatergrowth of pleonaste and pyroxene, and as far 

 as can be seen at present, appears to be a unique rock type. 

 He suggested that the spinel may be formed from the 

 syntectic magma produced by the re-solution of plagioclase 

 in a peridotitic magma, the crystallisation in such a melt 

 startiug in fibres perpendicular to the boundaries of the 

 solution cavities. The peculiar shape of these appears to 

 negative the suggestion that the intergrowth is a eutectic 

 of the latest formed minerals. 



The discussionjon Mr. 0. Hedley's Presidential Address 

 was resumed, Messrs. G. H. Halligan, J. E. Carne, C. A. 

 Sussmilch, and Drs. O. Anderson and H. I. Jensen taking 

 part. Mr. O. Hedley replied at some length. 



