PLATE 6 



EXPLANATION OF FIGURES 



Dissolution of kaiyos])liero. N. insiilata. 



60 Last chromatin mass (.IZ-chi-omosome) loavinsi; plasmasomo, diff'uso chro- 

 mosomes at peri])hery. X 1350. 



61 A~J Chromatin leaving plasmasome. X 1350. 



Growth stages. N. undulata 



62 Very .young si)ermatocyte. X 2250. 



63 Leptotene spireme; mitochondrial body outside nucleus. X 2250. 



64 Synizesis stage. X 2250. 

 65-66 Oriented spireme. X 2250. 



67 Withdrawal of spireme lo()])s from karyosjihere; mitochoii<lria] jilate. X 

 2250. 



68 Karyosphere fully formed; i)rotmsion from luiclear wall in region of mito- 

 chondrial plate. X 1350. 



69-70 Karyosphere breaking up into balls. X 1350. 

 71-73 Thread formation. X 1350. 



Growth stages. X. irrorata 



74 Jjooped sj)ireme. X 2250. 



75 Karyos])here broken up into balls. X 1350.- 



76 .1 . />'. 77 Tliicad furmation; deeply staining plasmasome in fig. 77. X 1350. 



112 



