BY FREDERICK CHAPMAN. 749 



Miliolina cf. tricarinata d'Orb. sp. 



Sigmoilina sp. 



Trillina howchini Schlumberger; very common. (PI. xxxix., 

 figs.7-9). 



Alveolina cucu77ioides, sp.nov.; very common, (PL xxxviii., 

 figs.5, 6). 



Truncatulina sp. 



Carpenteria sp. 



Gypsina globulus Reuss sp. 



Miogypsiyia compjlanata Schlumberger; frequent, 



Operculina complanata Defr.; very common, (PL xxxvii., 

 figs.i, 2; PLxxxviii., fig.3). 



Lejndocyclina cf, andreivsiana, Jones & Chapman; rare. 



L. angnlaris Newton & Holland; common. (PLxxxvii., fig. 2; 

 PL xxxviii., fig. 4). 



L. verheeki Newton k Holland; frequent. 



L. munieri Lemoine k R. Douville; very rare. (PLxxxvii., 

 fig. 2). 



iii. Limestones and Tuffs of (?) Post-Miocene Age. 



Details of specimens : — 



No. 87. — '* Limestone several hundred feet above sea-level, Port 

 Stanley, Malekula."t 



General characters: a hard cream-coloured limestone, with 

 whitish streaks and patches, due to partially decomposed organic 

 structures, in consequence of which the rock is rendered powdery 

 and cavernous, and difficult to preserve whole in thin sections. 



Microscopical characters : a study of this rock under the 

 microscope shows it to be largely of foraminiferal origin, 

 possibly more than 50 % of the rock consisting of their 

 tests. This example is rather of the nature of a reef-rock 

 than a consolidated beach sand, and it is also distinctly brecciated. 

 The larger organisms, as for example the reef-forming foramini- 

 feron, Polytrema planum, are frequently broken, the latter being 



t Mawson, op» cit. p.416. 



