10 ABT. fi. — Pv. B. NEWTON AND B. HOLLAND I 



Occurrence : In the Orbitoidal limestone from Sonai, Iriomote* 

 Island, Riü-Kiü. 



B. FOBAMINIFERA. 



Orbitoides. 



The genus Orbitoides is represented in the limestone from 

 Iriomote Island by innumerable specimens — the rock being crowd- 

 ed with them throughout (see Plate I, fig. 4) — but there appear 

 to be but two, or at the most three, species present, The striking 

 feature about them is their small size. The dimensions of the 

 specimens are remarkably uniform and there is no trace in our 

 slides of large examples. All the specimens belong to the Lepido- 

 cycline group which is characterised by the possession of lozenge- 

 shaped or spatuliform chambers in the median plane. 



Orbitoides (Lepidccyclina) angularis, sp. nov. 

 (PI. I, figs. 1 and 6, PI. Ill, fig. 7.) 



Characters : The species is dimorphic — that is to say, some 

 individuals have the initial chamber large, while in others it is 

 very small, practically invisible. They are distinguished here as 

 Form A and Form B respectively. 



Form A. — Shell discoidal ; central area of disc somewhat 

 flattened and slightly tubcrculate ; from edge of this flattened 

 area the shell rapidly decreases in thickness ; margin of disc 

 thin, slightly swollen and rounded at the extreme edge. Chambers 

 above and below the median plane irregular in shape but some- 

 what regularly disposed. External dimensions of shell 3 mm. in 



