I04 GARDINER. 



DESCRIPTION OF PLATE IX. 



All figures on this plate except Figs, i, 2, 4, and 5 are magnified about 1 140 

 times. 



Fig. I. Diagram showing relative position of ovary and vitellarium ; 0., ripe 

 or nearly ripe ova in the vitellarium ; ov., ovary ; vt., vitellus. 



Fig. 2. Immature ova in the vitelline gland ; 0., ova. 



Fig. 3. Vitelline gland cells ; n., nucleus. 



Fig. 4. Ripe ovum gorged with material from the vitellus. 



Fig. 5. Ovarian ova. 



Fig. 6. An ovarian ovum ; n., nucleus ; nc, nucleolus. 



Fig. 7. The nucleus of an ovum after it has just passed into the vitelline 

 gland ; 71c., nucleolus. 



Fig. 8. The nucleus of a nearly ripe ovum ; nc, nucleolus. 



Fig. 9. Nucleus with the archoplasmic body when it first appears ; ap., 

 archoplasm. 



Fig. 10. Division of the archoplasmic bodies. 



Fig. II. Beginning of the first maturation spindle. 



Fig. i;. Same. 



Fig. 13. Same. 



