FORAMINIFERA 



351 



%.'^ 





5?3^ 





11 



@ 



k J 





Fig. 160. Diagram illustrating the life-cycle of Peneroplis pertusiis 

 (Winter), a-f, megalospheric generation; g, gamete formation; h-k, 

 isogamy; 1-n, microspheric generation; o, multiple division. 



Genus Elphidium Montfort (Figs. 5; 161, h) 

 (Polystomella Lamarck) 



Test planispiral, at least in young, generally lenticular, septa 



double, canal system in higher forms; fossil and recent 



Family 27 Camerinidae 



