The Sarcodina 261 



uniflagellate (Fig. 5. 42), seems to be more common in Foraminiferida. 

 Gametogenesis in Iridia lucida (82) is representative. Final stages in the 

 process include a series of rapid nuclear divisions, resulting in many 

 small nuclei (Fig. 5. 41, F), and then segmentation of the cytoplasm to 

 produce uninucleate gametocytes (Fig. 5. 42). Each gametocyte develops 



Fig. 5. 42. AG. Gametogenesis and syngamy in Iridia lucida, x4000 

 (after Le Calvez): A. Gametocyte. B. Uninucleate gametocyte with para- 

 desmose and two pairs of flagella. C. Stage with two nuclei, just before fission. 

 D. Biflagellate gamete. EG. Successive stages in syngamy. H. Gamete of 

 Iridia diapJiana, x484.5 (after Le Calvez). I. Gamete of Gromia oviformis, 

 x3400 (after Le Calvez). J. Gamete of Planorbulina mediterranensis, x4000 

 (after Le Calvez). K. Gamete of Iridia serialis, x4845 (after Le Calvez). L. 

 Gamete of Webbinella crassa, x2400 (after Le Calvez). 



a pair of flagella and then undergoes flagellar duplication and nuclear 

 division. The paradesmose which appears in nuclear division is similar 

 to that of many Mastigophora. Cytoplasmic division results in active 

 flagellate gametes. The emergence of the mature gametes, which may 

 number many millions, has been compared to a cloud of smoke rolling 

 out of the test. 



