FORAMINIFERA 



81 



Ql 



FIG. 15. VERTEBRALINA. FIG. 16. TEXTULARIA. 



FIG. 17. SPIROLOCULINA. FIG. 18. TROCHAMMINA. 



FIG. 19. LAGENID/E (VARIOUS). FIG. 20. POLYSTOMELLA 



TYPES OF FORAMINIFERA. 

 (DRAWN BY MESSRS. HERON-ALLEN AND EARLAND.) 



6 



