FORAMINIFERA. 241 



markings are extremely variable ; one of the varieties is figured and this specimen was 

 not in any way water worn. Noted from Stats. LVf., LVIL. LVIIL, LXVIIL, and 

 other hauls at Stat. LX1V., also oft' Galle, Trincomalee and Chilaw. Recorded from 

 the Indian seas previously (2). 



Amphistegina radiata (FICHTEL and MOLL). 

 Rather rare, from Gulf of Manaar. Recorded by CHAPMAN (2) from Arabian seas. 



Heterostegina depressa, D'OEB. Plate, fig. ] 4. 



This is the most abundant foraminifer at practically all the stations. Its size is 

 on the whole above the average, often attaining a diameter of 18*5 millims., and it 

 gives therefore the chief character to the deposit. On these grounds a figure is 

 given here (fig. 14) from one of the most perfect specimens. Occurs at Stats. LVL, 

 LVIL, LVIIL, LX1V., LXVIIL, and off Galle, Trincomalee and Chilaw. Previously 

 recorded from Ceylon (1) and Indian seas (2). 



Operculina complanata (DEFR,). 

 Occurs sparingly at Stats. LVIL and LX1V. previously recorded from -Indian 



seas (2). 



.''./ * ' i * 



Operculina complanata, var. granulosa, LEYMERIE. 



This variety occurs somewhat frequently in the Gulf of Manaar. Like the previous 

 species, it has been already recorded from Indian seas (2). 



'2 l 



