FORAMINIFERA OF THE PHILIPPINE AND ADJACENT SEAS. 377 



Opercidina bartschi — Material examined. 



OPEKCULINA BART.SCKI, new species, var. PLANA, new variety. 



Description. — Test different from the typical form of the species in 

 the ornamentation of the surface, which, 

 after the early development, is usually 

 smooth, very thin, and translucent. 



This has occurred at the follovving sta- 

 tions: China Sea, off southern Luzon; vicin- 

 ity of Jolo; off northern Cebu; Sogod Bay, 

 southern Leyte; between Marinducjue and 

 Luzon; Pacific Ocean, east coast of Min- 

 danao; southern Mindanao; China Sea, off 

 Formosa; Palawan Passage ; between Samar 

 and Leyte; between Leyte and Mindanao; 

 northern Mindanao and vicinity; and be- 

 tween Negros and Siquijor. 



This usually occurs with the typical form 

 of the species, but is not as common. There 

 is a peculiar race which was noted only at D5257, southern Mindanao, 

 in 28 fathoms (51 meters). 



Fig. 14. — Operculina bartschi, 

 var. plana, new variett. 

 X 30. Side view. From sta- 

 tion dSIOo. 



