58-59. Equatorial plates of spermatogonia, 15 large chromosomes, 1 small one.
60. Resting nucleus of spermatogonium, showing plasmosome (p).
61. First spermatocyte, synizesis stage.
62. First spermatocyte, synapsis stage.
63-64. First spermatocyte, spireme stage, showing the larger and smaller heterochromosome associated with a plasmosome.
65-68. First spermatocyte, prophases.
