in Tertiary Rocks of Neiv Guinea. 211 



Dimensiom. — Rather more than 2 ram. in length. 



Occurrence. — In pebble No. 2. 



Distribution. — Europe and Indo- Pacific regions — Eorniosa, 

 Philippines, Japan, Christmas Island, Borneo, Sumatra, Celebes, 

 New Guinea, Australia, etc. ; and of Miocene age. 



Results. 



The more important facts connected with the examination of the 

 limestone pebbles prove that they may be referred to two geological 

 horizons, viz. the Eocene and Miocene. The Eocene fossils, found 

 in pebbles Nos. 1, 11, and 28, comprise: AlveoUna loichmanni, Laca- 

 %ina wichmanni, Orthophragmina sp, and cf. Pentellina saxorum. 

 The Miocene fossils, restricted to Nos. 2 and 12 pebbles, include: 

 Carpenteria cofioidea, AlveoUna sp., and Lithothamnium ramosissimum. 



Referring to the Eocene assemblage, it may again be pointed out 

 that the association of AlveoUna and cf. Pentellina saxorum resembles 

 the fossiliferous contents of the "Clibs" and " Mixen" rocks of 

 England as well as the Miliolitic limestone of Paris, which belong to 

 the Lutetian or Middle Eocene group of the Tertiaries; hence, it is 

 suggested that a nearly similar age may be determined for the New 

 Guinea limestones in question. 



On account of the absence of LepidocycUna among the Miocene 

 organisms, it is somewhat difficult to estimate their true geological 

 position in that great formation. The limestones of Papua (British 

 New Guinea) and Mt. Carstensz (Dutch New Guinea), described 

 respectively by Mr. Chapman and the present writer, have yielded 

 various .forms of Lepidocyclines, which, studied on the basis of 

 researches propounded by Professor H. Douville' in connexion with 

 similar fossils from some Tertiary limestones of Borneo and the 

 Philippine Islands, prove them to be of Aquitanian or older Miocene 

 age. In all probability the fossils now described belong to the same 

 stage of the Miocene, although the Nullipore Lithothamnium ramo- 

 sissimum, it sliould be remembered, is particularly abundant in the 

 "Leithakalk" of Europe (Vienna Basin), which is included in the 

 Tortonian or youngest marine stage of the Miocene system. 



EXPLANATION OF PLATES VIII AND IX. 



Plate VIII. 



Alveolina wichmanni, Eutten. 



Fig. la. Longitudinal section of interior, x 10. 

 ,, 2a. ,, ,, ,, X 20. 



,, 3, 4a. Internal longitudinal sections showing more regularly disposed 



layers than are represented in Figs, la and 2a. x 10. 

 ,, 5. Longitudinal view of a weathered specimen showing the margins of 



successive layers and external transverse striations. x 10. 

 ,, 6. Transverse section of specimen preserved on the polished surface 



of the pebble, in which the more or less equidistant apertures 



represent the longitudinal channels that perforate the organism. 



x 25. 



•" " Les Foraminiferes dans le Terfciaire de Borneo": Bull. Soc. G^ol. 

 France, ser. IV, vol. v, p. 454, 1905. " Les Foraminiferes dans le Tertiaiie des 

 Philippines " : Philippine Journ. Sci., vol. vi, No. 2, pp. 53-80, pis. A-D, 1911. 



