SEX DETERMINATION IN DINOPHILUS GYROOILIATUS. 371 
Fig. 60. — Nucleus of female egg showing ten separate vesicles. 
Perenyi. 
Fig. 61. — Female nucleoli of oogonial cell showing endocliromatic 
granules. 
Fig. 62. — Female egg. Second segmentation division. Twenty 
chromosomes. 
Figs. 63 and 64. — Female nucleoli of oogonial cells showing endo- 
chromatic granules. 
VOL. 57, PART 3. NEW SERIES. 
