IO2 E. L. SHAFFER. 



PLATE III. 

 (Figs. 28 to 36.) 



FIG. 28. Side view of maturation tetrads of L. delata. 

 FIG. 29. Side view of maturation tetrads of L. fusca. 

 FIG. 30. Side view of maturation tetrads of Pelidonota punctata. 

 FIG. 31. Early anaphase of first maturation division in L. fusca showing 

 separation of sex pair. 



FIG. 32. Anaphase of first maturation in Pelidonota. 

 FIG. 33. Telophase of first maturation in L. delata. 



FIG. 34. Telophase of first maturation in L. delata in which the sex elements 

 have failed to disjoin, and have passed to one daughter cell. 



FIGS. 35, 36. Daughter plates of second spermatocyte of L. delata and Pelido- 

 nota, respectively. 



