574 Theophilus s. Painter, 



Fig. 47. Spermatids which show the presence of ctetosomes. 

 Fig. 48, Same. 



The following figures are taken from Maevia vittaia, tufted variety. 

 2500: 1. 



Fig. 49. Synaptic contraction. 



Fig. 50. Same showing planosome in nuclear cavity. 



Fig. 51. Pachytene stage. 



Fig. 52. Same showing the pachytene-threads after they have lost 

 their loop-like form. 



Fig. 53. Very early prophase showing the planosome. 



Fig. 54. First division showing accessory chromosome. 



Fig. 55. Same showing planosome. 



Fig. 56. Equatorial view showing planosome. 



Fig. 57. Same. 



Fig. 58. Telophase of first division. 



Fig. 59. ,, Resting stage" of young secondary spermatocyte. 



Fig. 60. Second division showing precocious division of accessory 

 chromosome elements. 



Fig. 61. Telophase of second division showing planosome lagging 

 behind in spindle. 



Fig. 62. Spermatid showing presence of planosome. 



Plate 32. 



Figs. 63 and 64 taken from dividing gland cells of the female of 

 Maevia vittata. Figs. 65 and 66 taken from the testis of Diige.sieUa hoitzi. 



The rest are drawings from Ainaurobius sylvestris. 



Fig. 63. Dividing gland cell of the female of Maevia vittata showing 



the accessory chromosomes. 



Fig. 64. Equatorial view of same taken from two consecutive sections. 



Fig. 65. First division in Dugesiella Jientzi showing accessory chro- 

 mosome. 



Fig. 66. Equatorial view of same. 



Fig. 67. „Rest period" for Auiaaroltiiis si/lrestris. 



Fig. 68. Same. 



Fig. 69. Pachytene stage of Autaurobins s/jlvestris. 



Fig. 70. Late diplotene stage showing the early appearance of the 

 centrosomee. 



Fig. 71. First division in Amaurobins sijli:rstris. 



Fig. 72. Same, showing three ctetosomes. 



