ON THE LIPE-HISTORY OP THE FORAMINIFERA. 119 



all that remains of it. He considers that the GloUgerina shell 

 IS gradually absorbed, and ultimately disappears. With regard 

 to the contained OloUgerina shell it was shown that, as in free 

 living GloUgerin(B, its terminal chambers are frequently covered 

 with spines, and that these reach to the Orbulina shell and fuse 



Orhulina universa, bottom specimens, Brady Collection, Glohigerina-Orhulina 



series, x 170. 

 a-c. OrbuUnas with contained Glohigerina chambers (represented in optical 

 section). These are seen in different stages of absorption. The spines are 

 only seen in h. 



d. An empty OrJmlina shell. 



e. A specimen in which the Orbulina shell does not completely enclose the 

 Globigerina chambers. 



