DEPARTMENT OF MINES MEMOIRS OF THE GEOLOGICAL SURVEY OF NEW SOUTH WALES. C. S. WILKINSON, F.G.S., Ac., GEOLOGICAL SUItVEYOK-IN-CHAttGE. PALAEONTOLOGY, No. 5. R. ETHERIDGE, JNR., PALAEONTOLOGIST. A MONOGRAPH OF THE CARBONIFEROUS AND PERMO-CARBONIFEROUS INVERTEBRATA OF NEW SOUTH WALES. Part I.-CCELENTERATA. BY R. ETHERIDGE, Junr., Palaeontologist and Librarian to the Geological Survey of New South Wales; and Palaeontologist to the Australian Museum, Sydney. ISSUED BY DIRECTION OF THE HON. SYDNEY SMITH, M.P., MINISTER FOR MINES AND AGRICULTURE. SYDNEY: GEORGE STEPHEN CHAPMAN, ACTING GOVERNMENT PRINTER. lid 50—91 A 1891.