40 J. E. WODSEDALEK. 



PLATE IV. 



38. Late anaphase of division in a primary spermatocyte showing eight chro- 

 mosomes at one pole and eight plus the two accessories at the other. 



39. One end of a late anaphase of division in a primary spermatocyte showing 

 eight chromosomes. 



40. One end of a late anaphase of division in a primary spermatocyte showing 

 ten chromosomes (eight plus the two accessories). 



41. Resting stage of a secondary spermatocyte showing two nucleoli and a con- 

 spicuous centrosome. 



42. Resting stage of a secondary spermatocyte without the large nucleoli. 



43. Two contiguous secondary spermatocytes of which one shows four bivalent 

 chromosomes in metaphase of division, and the other four bivalents plus the two 

 accessory chromosomes in metaphase of division. These two cells are no doubt 

 the products of a division of a primary spermatocyte in which eight chromosomes 

 pass to one pole and eight plus the two accessories to the other. 



44. Early metaphase of division in a secondary spermatocyte which received 

 the two accessories, showing six chromosomes in all. 



45. Early metaphase of division in a secondary spermatocyte which did not 

 receive the accessories, showing only the four large bivalents. 



46. Late prophase of division in a secondary spermatocyte which did not receive 

 the accessories. 



47. Late prophase of division in a secondary spermatocyte which received the 

 accessories, showing a total of six chromosomes. 



48. Late anaphase of division in a secondary spermatocyte which received eight 

 chromosomes, showing four chromosomes at each pole. 



49. A spermatid showing four bivalent chromosomes which is apparently one 

 of the resulting cells of the division of a secondary spermatocyte which received 

 eight chromosomes. 



