The minutes of the meetings of the trustees of the Australian Museum show that in 1881 a committee, consisting of Dr. Cox, Mr. Wilkinson, and Professor Liversidge, was appointed for the management of the exploration of caves and rivers, and it was decided that the following caves should, if possible, be examined in the order as written:--Wellington Caves, Cowra, or Belubula Caves, Abercrombie, Wollombi, Fish River (now Jenolan), Wombeyan, Wallerawang, Cargo, Yarrangobilly, Murrumbidgee, Kempsey. The Goodradigbee caves were also included, and from them was taken a great quantity of bones of small animals, with a number of jaw, thigh, hip, and shin bones of some animals of the kangaroo family. The smaller bones were those of mice, bats, birds, and marsupials. In the Wellington breccia cave a shaft was sunk, and on the 20th September, 1881, Mr. E. P. Ramsay, curator of the Museum, reported, among other things, the following:--"A great number of interesting bones have already been obtained from this shaft, but the mass of 35 feet of bone breccia which we passed through shows that we have here a large field for exploration. From this shaft we have obtained bones of the following animals, besides a great number of small bones yet undetermined--Diprotodon, macropus, palorchestes, sthenurus, procoptodon, protemnodon, halmaturus, thylacinus, bettongia, sarcophilus, phascolomys, dasyurus, phalangista, pteropus (?), bats, rodents (mus), a few lizards' bones, and a few vertebræ of lizards and snakes." Other caves also were explored, but it was found that the bones obtained from them were of recent origin. It is a question whether it would not be desirable to make still further investigations. The osseous breccia--where it exists--appears to be similar in all the caves. There are rifts and pits and chambers where animals have retired to die, and where from time to time their bones have been formed into cement with the liquefied rock, which in process of time has again hardened and become a solid compound of bone and stone.