Studies in Spermatogenesis (Part 2 of 2)

by N. M. Stevens

164-171. First spermatocyte, metaphase.

172. First spermatocyte, anaphase.

173-174. First spermatocyte, equatorial plates.

175-176. First spermatocyte, late anaphase.

177. Second spermatocyte, equatorial plates.

178-179. Second spermatocyte, telophase, a₁, archoplasmic material.

180-186. Spermatids in different stages; a₁, archoplasmic material from first spermatocyte spindle, a₂ archoplasmic material from second maturation spindle.

Spruce-borers (Family Buprestidæ).

187. First spermatocyte, metaphase.

188-189. First spermatocyte, equatorial plates of two species, 10 and 11 chromosomes.