206 R. Bullen Newton — Foraminifera, etc., 



associated "with Alveolma and Nummulina, and on account of its 

 frequent occurrence he named the limestones *' Lacazinenkalk " and 

 considered them as of Eocene age. On the same occasion Martin 

 also referred to the discovery of Alveolina by Dr. H. A. Lorentz in 

 the limestones of Mt. Wilhelmina, situated in south-central Dutch 

 territory at an altitude of more than 13,000 feet or 4,461 metres. 

 The genus was found accompanying Nummulites, and in consequence 

 ascribed to the Eocene period.' A still further reference occurs in 

 Martin's memoir regarding Alveolma, mention being made of its 

 identification in the limestones of Digoel Eiver (S.W. New Guinea) 

 associated with LepidocycUna and Lithothamnium and stated to belong 

 to the older Miocene. 



The latest notice of importance respecting the occurrence of 

 Alveolina in New Guinea is to be found in a report by Dr. L. Rutten,^ 

 published in 1914, containing figures and description of a new species, 

 A. wichmajini, from the Eocene limestones of Dramai Island, Triton 

 Bay, south-west New Guinea, which is stated to have been associated 

 with Lacazina wiclimanni, Schlumberger. The palaeontology of the 

 older Miocene limestones of New Guinea has rather recently been 

 studied, and quite independently, by Mr. F. Chapman,^ of the 

 National Museum, Melbourne, and the present writer,* with very 

 similar results. The principal organisms recognized were various 

 species of LepidocycUna, Cycloclypeus, Carpenteria, Lithothamnium 

 ramosissimum, etc., an assemblage indicative of the Upper Aquitanian, 

 which represents t)ie oldest stage of the Miocene formation. 



The Limestone Pebbles. 



The pebbles submitted for examination are numbered 1, 2, 11, 12, 

 and 28, the largest being Nos. 1 (90 X 50 mm.) and 2 (105 x 

 60 mm.), whereas the others are, roughly, about a third of their 

 size. They consist of slightly different-coloured limestones, which 

 in connexion with their organic contents are considered to belong to 

 two different Tertiary horizons: the Eocene and the Miocene. 

 Being rounded and of water-worn character, they may be termed 

 rolled-limestone pebbles; and further, having been collected. from 

 river-beds in the upper reaches of the Fly River, their origin 

 undoubtedly points to the great limestone development which, as 

 high mountain ranges, runs east and west through the wide central 

 region of New Guinea. 



^ For some unexplained reason this limestone from Mt. Wilhelmina with 

 Alveolina has been rather recently determined as of Cretaceous age in an 

 article on "Papua" contained in the Federal Handbook, prepared for the 

 84th Meeting of the British Association for the Advancement of Science, held 

 in Australia, 1914, pp. 256, 321. 



^ ' ' Foraminiferen-Fuhrende Gesteine von Niederlandisch Neu-Guinea ' ' : 

 A. Wichmann's Nova Guinea, vol. vi, " Geologie," livr. ii, pi. ix, figs. 1, 2, 

 p. 45, 1914. 



^ " Description of a Limestone of Lower Miocene age from Bootless Inlet, 

 Papua " : Journ. Proc. Eov. Soc. New South Wales, vol. xlviii, pt. ii, pis. vii-ix, 

 pp. 281-301, 1914. 



* E. B. Newton, the Wollaston Expedition Eeport, 1916, previously 

 alluded to. 



