PLATE IV 

 RIPE AND SPENT OVARIES OF BDELLOSTOMA BURGERI 



Fig. 14. A female with eggs almost mature, measuring from 20 to 22 mm. in length, and 7 to 8 mm. in 



width. 

 Fig. 15. A female which has recently discharged her ova. Each ovarian follicle is ruptured at one end. 

 Fig. 16. A female with empty ovarian follicles (corpora lutea) which are "retracted.'" The follicles 



present a shrunken and wrinkled appearance indicating that they are being resorbed. 



All the figures on this plate are about one-fourth off the original size. 



