362 THOS. H. MONTGOMERY, 



Fig. 84. Nucleus in synapsis stage, showing 4 chromosomes viewed 

 from the central pole of the nucleus. 



Figs. 85 — 87. Nuclei in synapsis stages, the chromosomes seen on 

 cross section. 



Fig. 88 A — M. Details of chromosomes in synapsis stages, from 

 different nuclei. A a half (univalent) chromosome ; B — G portions of 

 bivalent chromosomes ; H — L whole bivalent chromosomes ; M portions 

 of 3 chromosomes. 



Fig. 89. Lateral view of nucleus in synapsis stage, showing one 

 whole and a portion of another chromosome. 



Fig. 90. Lateral view of a nucleus in synapsis, showing one whole 

 chromosome. 



Figs. 91, 92. Spermatocytic telophases, showing portions of chromo- 

 somes. 



Fig. 93. Spermatocytic telophase, seen from the central pole of 

 the nucleus, only the central portions of the chromosomes visible. 



Figs. 94 — 96. Telophases of spermatocytes, all chromosomes not 

 shown; in Fig. 94 details of cell body not shown. 



Fig. 97. Lateral views of spermatocytes in telophase, only a few 

 of the chromosomes shown. 



Fig. 98. Spermatocytic nucleus in late telophase, most of the 

 chromosome boundaries indistinct. 



Fig. 99. Spermatocyte in late telophase, lateral view. 



Fig. 100. Spermatocyte nucleus, rest stage; chromatin drawn as 

 seen in one plane. 



Fig. 101. Spermatocyte, lateral view of rest stage; centrosomes (?) 

 in idiozome sphere ; chromatin drawn as seen in one plane. 



Fig. 102. Spermatocyte nucleus, late telophase; chromatin drawn 

 as seen in one plane. 



Figs. 103, 104. Lateral views of spermatocytes in rest stages; 

 cytoplasmic details not shown ; chromatin drawn as seen in one plane. 



Fig. 105. Spermatocytic nucleus, rest stage, showing a portion of 

 a persisting chromosome. 



Fig. 106. Spermatocyte, lateral view of rest stage, chromatin 

 drawn as seen in one plane. 



Fig. 107. Unusally small nucleus of spermatocyte in rest stage. 



Fig. 108. Lateral view of spermatocyte in late rest stage or be- 

 ginning of prophase. 



Fig. 109. Group of spermatocytes in rest stage ; the details of the 

 one at the left hand only drawn in, and its chromatin drawn as seen 

 in one plane. 



Figs. 110, 111. Lateral views of 2 spermatocytes, rest stage, only 

 the idiozome spheres drawn in. 



Plate 21. 



Figs. 112 — 126. Idiozome spheres of spermatocytes. All from 

 rest stages except Fig. 124 (telophase) and Fig. 126 (early telophase). 



