86 THOS. H. MONTGOMERY jr., 



Fig. 14. Kosette of spermatogonia, spirem stages. 



Fig. 15. Spermatogonia, segmentation of the spirem. 



Figs. 16, 17. Rosettes of spermatogonia, tlie segmentation of the 

 spirem ended. 



Figs. 18 — 21. Spermatogonia, prophases, shortening of the chromo- 

 somes. 



Fig. 22. Unusually large spermatogonium, the whole nucleus not 

 shown, with an abnormal number of chromosomes. 



Fig. 23. Spermatogonium, prophase. 



Fig. 24. Rosette of spermatogonia, near the end of the prophase. 



Figs. 25 — 29. Spermatogonia, successive stages in the arrangement 

 of the chromosomes into the equator of the spindle. 



Figs. 30, 31. Spermatogonia, monaster stage. 



Fig. 32. Spermatogonium seen obliquely from the side; abnormal 

 case with two spindles. 



Figs. 33 — 37. Spermatogonia, pole views of the chromosomal plate 

 of the monaster stage. 



Figs. 38 — 40. Spermatogonia, metakinesis. 



Figs. 41 — 45. Spermatogonia, dy aster stages; in Fig. 44 the 

 chromosomes do not form a fused plate, but are only very densely 

 grouped. 



Figs. 46, 47. Pole views of the chromosomes of daughter cells 

 (1st spermatocytes) of a spermatogonic dyaster. 



Figs, 48 — 54. 1st spermatocytes, early anaphases. 



Plate 2. 



Figs. 55 — 57. 1st spermatocytes, early anaphases ; Figs. 55 and 57 

 reproduce Hermann's stain. 



Figs. 58 — 60. 1st spermatocytes, commencement of synapsis. 



Figs. 61 — 64. 1st spei'matocytes, synapsis. 



Figs. 65 — 75. 1st spermatocytes, synapsis. The colored figures 

 represent Hermann's stain. 



Figs. 76, 77. 1st spermatocytes, commencement of the postsynapsis 

 (the colors as in the preceding figures). 



Figs. 78 — 88. 1st spermatocyte, postsynapsis. In all the whole 

 nucleus is shown. 



Fig. 89. 1st spermatocyte, telophase, portion of nucleus. 



Figs. 90, 91. 1st spermatocytes, telophase, the whole nuclei shown. 



Figs. 92, 93. 1st spermatocytes, telophase, showing two of the 

 large cell syncytia. All the nuclei are shown in their entirety, except 

 that one marked x. In Fig. 92 the whole mass of cytoplasm is not 

 drawn. In Fig. 93 a whole spermatocyt is represented. 



Fig. 94. A group of degenerating cells, the cytoplasm drawn in 

 only one of them. 



Figs. 95 — 100. 1st spermatocytes, rest stage. The whole nucleus 

 represented in Figs. 96, 97 and 99. 



