28 



THE FOEAMINIFEEA 



two forms of one species. For example, in B'doculina 

 depyessa there are two forms — A, with a large 

 central chamber 200-400 /x ^ in diameter, and with 

 an outside diameter of the test of 2-1 mm. ; and B, 



MiLioLiNA (Quinqueloculina) seminulum. 

 Form A. x 100. 



MiLioLiNA (Quinqueloculina) seminulum. 

 Form B. x 90. 



Fig. 17. After ScJihimberger. 



with a small central chamber 20 /x in diameter and 

 an outside diameter varying from 1*5 mm. to 2'64 mm. 

 In form A of this species the arrangement of the 



1 „ _ J 



r Tooo 



millimetre. 



