﻿part 1] PROCEEDINGS OF THE GEOLOGICAL SOCIETY. lxxxi 



into two sections — Eulepidina and Nephrolepidina : the first 

 including forms of generally large size, recognized as Aquitanian ; 

 the second for those of small dimensions, regarded as Burdigalian — 

 these geological divisions representing the oldest stages of the 

 Miocene System. This distinction, however, was not applicable 

 to the New Guinea limestones nor to corresponding rocks from 

 Christmas Island, as both large and small species occurred in 

 association ; it was, therefore, suggested that the age of the New 

 Guinea material might he referable to the later part of the 

 Aquitanian. Several writers have already written on rather similar 

 limestones from various parts of New Guinea, although we are 

 indebted to Dr. K. Martin for the first announcement in connexion 

 therewith : he reported the discovery in 1881 of Lepidocycline 

 organisms from rocks found in the northern and south-western 

 districts of the country (Geelvink Bay, islands of Kei, Aru, etc.), 

 which he attributed to the older Miocene. The same author also 

 referred to the occurrence of similar organisms in Mount Wil- 

 helmina, obtained by Dr. Lorentz, beneath which the Alveolina 

 Limestone was identified, proving the existence of Eocene rocks. 



The Cyeloclypeus remains, which are of frequent occurrence in 

 the present material, bear a strong resemblance to Prof. Douville's 

 new genus and species from the Miocene of Borneo, known as 

 Spiroclypeus orhitoideus. This genus was stated to have all the 

 characters of Cyeloclypeus, but differs from it in the possession 

 of superficial chamberlets in the shelly layers of the central region. 

 Becent investigations, carried out by the speaker, had proved the 

 presence of this character (hitherto unrecognized) in recent forms 

 of Cyeloclypeus from Funafuti ; hence the retention of Spiro- 

 clypeus now appeared to be unnecessary. A full report on this 

 New Guinea collection by the speaker had been lately published, 

 entitled : ' Notes on some Organic Limestones, &c. collected by 

 the Wollaston Expedition in Dutch New Guinea,' — forming No. 20 

 of a series of reports, and it was to be included in vol. ii of those 

 reports. 



By permission of the Secretary of State for the Colonies, 

 Mr. J. E. N. Green exhibited a manuscript report by Mr. J. E. 

 Eaglesome, C.M.G., on the Udi Colliery in Nigeria, containing 

 a number of photographs and plans, and made some observations 

 on the economic importance of this development in Equatorial 

 Africa. There were placed with it for comparison two photo- 

 graphs of the outcrop of manganese-ore in the Gold Coast, also 

 discovered by Mr. A. E. Kitson, P.G.S. 



vox. LXXII. 



