588 L. DONCASTER. 
Fig. 2.—N. ribesii. First polar mitosis [cef. Henking (6), pl. vii, 
fig. 203]. 
Fic. 3.—N. ribesii. Beginning of second polar mitosis. 
Fic. 4.—N. lacteus. Second polar mitosis, anaphase. 
Fig. 5.—N. ribesii. Close of second polar mitosis; three polar nuclei 
and egg-nucleus. 
Fic. 6.—N. ribesii. Egg-nucleus and three polar nuclei; two inner polar 
nuclei in contact (combined from three successive sections). 
Fic. 7.—N. ribesii. ‘Two inner polar nuclei beginning to fuse. 
Fie. 8.—N. ribesii. Fusion of two inner polar nuclei; outer polar 
nucleus degenerating. 
Fic. 9.—N. ribesii. Resolution into chromosomes of ‘ fusion-nucleus.”’ 
Fie. 10.—N. ribesii. Chromosomes in polar protoplasm. Two hours 
later than Fig. 9. 
Fig. 11.—N. ribesii. Chromosomes in polar protoplasm; three groups. 
Fie. 12.—N.ribesii. Abnormal egg developing according to the female- 
producing type. ‘Two outer polar nuclei, and scattered chromosomes in polar 
protoplasm derived from the inner polar nucleus (combined from three suc- 
cessive sections). 
Fic. 18.—N.lacteus. ‘Telophase of second polar mitosis (combined from 
two successive sections). 
Fie. 14.—N. lacteus. Two inner polar nuclei resolved into chromosomes. 
PLATE 36. 
Fic. 15.—P. luteolum. Three polar nuclei; the egg nucleus has sunk 
into the yolk (combined from two successive sections). 
Fic. 16.—P. luteolum. Polar nuclei beginning to degenerate at edge of 
ege (combined from two successive sections). 
Fie. 17.—P. luteolum. Degeneration of polar nuclei. 
Fie. 18, a and d6.—P. luteolum. Two successive sections of an abnormal 
egg. Polar nuclei forming a large mass at the outer edge of the polar proto- 
plasm. 
Fie. 19.—P. luteolum. Abnormal egg. Large nucleus deep in tlie polar 
protoplasm. 
Fic. 20, a and 6.—H. rufa, a. Two inner polar nuclei; the outermost 
has already degenerated. 4. Egg nucleus in the yolk of the same egg. 
Fic. 21.—H. rufa.—Inner polar nucleus; resolution into chromosomes. 
