Reports & Proceedings—Geological Society of London. 331 
Guinea, with an altitude of about 16,000 feet. The foraminiferal 
organisms determined in this material included five species of 
Lepidocyclina (sumatrensis, martini, neodispansa, murrayana, and ct. 
insule-natalis), Amphistegina, Carpenteria, Cycloclypeus (cf. orbitordeus), 
etc.; the marine alga or nullipore, Lithothamnium, was, also, largely 
represented. This assemblage compares favourably with that which 
characterizes rocks of similar age in other Pacific regions, such as 
Christmas Island (Indian Ocean), Formosa, the Philippines, Borneo, 
Celebes, Sumatra, Nias, Timor, Australia, besides indicating 
a Miocene origin. It was pointed out that the genus Orbitordes of 
A. @’Orbigny had been restricted by Schlumberger (relying on the 
researches of Giimbel, Verbeek, and others) to species having 
rhomboidal equatorial chambers and belonging only to Cretaceous 
times; species furnished with rectangular chambers, and recognized 
as Orthophragmina of Munier-Chalmas, were limited to the Kocene 
- and Oligocene formations; while Giimbel’s genus Lepzdocyclina, 
with rounded or hexagonal chambers, included species of Miocene and 
later age. As the result of a study of species from Borneo and the 
Philippines, Professor Douvillé had proposed to divide Lepidocyclina 
into two sections—Hulepidina 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 
_ be 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 north 
and south-western end 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 
Wilhelmina, obtained by Dr. Lorentz, beneath which the Alveolina 
Limestone was identified, proving the existence of Hocene rocks. 
The Cycloclypeus remains, which are of frequent occurrence in the 
present material, bear a strong resemblance to Professor Douvillé’s 
new genus and species from the Miocene of Borneo, known as 
Spiroclypeus orbitocdeus. This genus was stated to have all the 
characters of Cycloclypeus, but differing from it in the possession 
of superficial chamberlets in the shelly layers of the central region. 
Recent investigations, carried out by the speaker, had proved the 
presence of this character (hitherto unrecognized) in modern forms 
of Oycloclypeus from Funafuti; hence the retention of Sprroclypeus 
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, etc., 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. 11 of those reports. 
