A Part of the fossils described in the accompanying paper were presented to the British Museum (Natural History) by the late Mr. Edward T. Hardman, F.G.S., F.R.G.S.I, in December, 1886; having been collected by him during his exploration of the Kimberley District of Western Australia, in 1883. Some additional specimens, forming a part of this collection, have been obligingly forwarded to me by Professor Edward Hull, LL.D., F.R.S., Director of the Geological Survey of Ireland; having been found, since Mr. Hardman's death, in the Survey Office, Dublin.