NOTE ON THE STRUCTURE OF ANNUL ARIA AUSTEALIS, FEISTMANTEL. By R. Etheridge, Jun., &c. (Palaeontologist to the Australian Museum, and Geological Survey of N. S. Wales). (Plates II. & III.) In his " Palaeozoische unci Mesozoische Flora des ostlicheu-Australiens," * Dr. Ottokar Feistmantel described a species of the well-known Equisetaceous plant Annularia, as A. ausfralis.f In this genus the stem is articulate, possessing solid diaphragms at the joints, the former giving support to pinnate or bipinnate branches. The leaves are verticillate, and more or less obliquely articulate on the branches, whilst those placed laterally, in regard to their position on the branch, are generally longer than the others. Each leaf is always more or less elongate, always lanceo-late, and traversed by a median nerve. The specimens figured by Feistmantel were very fragmentary, consisting of six isolated, or partially isolated, whorls of leaves and are from the Lower Coal Measures at Greta, associated with Glossoptei'is. It must not be forgotten, however, that the late Rev, W. B. Clarke, in his paper " On the Occurrence and Geological Position of Oil-bearing Deposits in New South Wales,"! mentions that the cannel coal at Reedy Creek is "in places full of fronds of Glossojjteris, and a plant branching after the manner of Asterojjhyllites, which lies in perfect unrumpled * 4to Cassel, 1878-79. + PI. 25, f. 6 and 6a. t Quart. Journ. Geol. Soc. 1866, xxii. p. 445.