64 



BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



FIG. 37. PROTOOPALINA SATURNALIS ; a, AN ORDINARY INDIVIDUAL ; b, AN INDIVIDUAL IN 



LONGITUDINAL FISSION ; C, A DAUGHTER CELL FROM LONGITUDINAL FISSION ; d AND C, 

 INDIVIDUALS or TUB STOCKY FORM, THE LATTER PREPARING FOR FISSION ; f, AN ANAPHASE! 

 NUCLEUS; ff, AN INDIVIDUAL LEAVING THE CYST; H, A MICROGAMETB ; /, IS MAGNIFIED 



1,500 DIAMETERS, THE OTHER FIGURES 600 DIAMETERS. (After Leger and Duboscq.) 



