172 H. W. BEAMS. 



PLATE II. 



FIG. 17. Two nuclei formed by a submerged first polar spindle. 



FIG. 1 8. Early first cleavage amphiaster formed from a submerged 

 nucleus of the first polar spindle. 



FIG. 19. Eccentric monaster first polar division. 



FIG. 20. Resting stage of a second polar monaster that shows approxi- 

 mately 50 small chromosomes. 



FIG. 21. First cleavage concentric monaster. 



FIG. 22. Prophase triaster first polar division. 



FIG. 23. Triaster second polar division. 



FIG. 24. Late telophase triaster first polar division. 



FIG. 25. Fusion of three nuclei formed by triaster of second polar 

 division. 



FIG. 26. Fusion of three nuclei that was formed from triaster of first 

 polar division. 



FIG. 27. Amphiasters of two submerged nuclei formed from the first or 

 second submerged polar divisions. 



FIG. 28. Four nuclei formed from division of two submerged nuclei. 



FIG. 29. Six nuclei formed from division of three submerged nuclei. 



FIG. 30. Triaster and cytasters. 



FIG. 31. Asters formed around masses of chromatin material. 



