iMKTAPHASE SPINDLE IN FOKEICULA AURIOULAlilA. 
263 
Fig. 14. — Ditto, later, corresponding with fig. 9. Specimen a. 
Fig. 15. — Ditto, later, corresponding with fig. 10. Specimen A. 
Fig. 16. — Lateral view of equatorial plate in late secondary sperma- 
tocyte metaphase, corresponding with figs. 6 and 11. Specimen b. 
Fig. 17. — Lateral view of equatorial plate at conclusion of 
secondary spermatocyte metaphase, corresponding with figs. 7 and 12. 
Specimen b. 
Fig. 18. — Lateral view of equatorial plate in earliest secondary sperma- 
tocyte anaphase, corresponding with figs. 8 and 13. Specimen b. 
Fig. 19. — Ditto, later, corresponding with figs. 9 and 14. Specimen b. 
Fig. 20. — Ditto, later, corresponding with figs. 10 and 15. Speci- 
men B. 
Fig. 21. — Polar view of primary spermatocyte metaphase, showing all 
chromosomes. Specimen d. 
Figs. 22 to 24. — Ditto. Specimen a. 
Fig. 25. — Polar view of equatorial plate in earliest primary spermato- 
cyte anaphase. Specimen b. 
Figs. 26-29. — Lateral views of equatorial plate at conclusion of 
primary spermatocyte metaphase, showing daughter- dyads resulting 
from completed constriction of tetrads. The unequal pair of hetero- 
chromosomes is marked x. Specimen A. 
Fig. 30. — Lateral view of equatorial plate in late primary spermato- 
cyte metaphase, showing constriction of tetrads. Specimen a. 
Fig. 31. — Lateral view of equatorial plate at conclusion of primary 
spermatocyte metaphase, corresponding with figs 26-29. The unequal 
pair of heterochromosomes is marked x. Specimen A. 
Fig. 32. — Lateral view of equatorial plate in earliest primary sperma- 
tocyte anaphase, showing divergence of daughter-dyads. Specimen a. 
Fig. 33. — Ditto, later. Specimen A. 
Figs. 34-37. — Polar views of spermatogonial metaphase, showing all 
chromosomes. Specimen d. 
Fig. 38. — Polar view of earliest spermatogonial anaphase. Specimen b. 
Fig. 39. — Lateral view of equatorial plate in early siDermatogonial 
metaphase, before constriction of bivalent chromosomes has begun. 
Specimen D. 
Fig. 40. — Lateral view of equatorial plate in late spermatogonial 
metaphase, showing constriction of dyads. Specimen D. 
Fig. 41. — Lateral view of equatorial plate at conclusion of spermato- 
gonial metaphase, showing univalent daughter-chromosomes resulting 
from completed constriction of dyads. Specimen d. 
