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NOTES AND EXHIBITS. 



Mr. Stead exhibited preparations of a pelagic crustacean 

 Galathea sp. (from \\ to 2 in. in length), collected by Captain 

 W. Waller, of the s.s. Westralia, between south-eastern Aus- 

 tralia and New Zealand ; the animals are known to shipping- 

 masters as " Whale-food"; and at times myriads of them cover 

 so large an expanse of water as to impart to it a uniform 

 red tinge. Also a very handsome and almost perfect living 

 specimen of the Murrumbidgee Crayfish, (Astacopsis serratus, 

 Shaw), and he drew attention to the fact that when this animal is 

 disturbed suddenly it emits a curious hissing sound, resembling 

 somewhat that made by a snake* And two photographs taken 

 at Ben Buckler, Bondi, which showed in a remarkable manner 

 the effect produced by atmospheric erosion, aided by the vibration 

 set up by the waves, on cliffs of the Hawkesbury Sandstone. 

 The disintegration of the cliffs is also considerably helped by the 

 basaltic dykes which here and there intersect the rock, and which, 

 upon decomposing, isolate large sections. 



Mr. Baker exhibited herbarium specimens and samples of 

 the essential oils and timber of the Eucalypts described in his 

 paper 



Mr. Froggatt showed an extensive series of Psyllidce, and of 

 their lerp-structures in illustration of his paper. 



Mr. Palmer described a case of hydatids in a Black-tailed 

 Wallaby (M. ualabatios, Desm.), which died in captivity after a 

 few days' illness. On dissection the chest cavity was found to 

 contain several hundred loose pellucid cysts varying in size from 

 that of a pea to that of a duck's egg, irrespective of a number 

 imbedded in the lobes of the lunss. 



For an earlier notice of this habit, vide Proceedings, (2), i., 1886, p. 505 — Ed. 

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