Studies in Spermatogenesis - LightNovelsOnl.com
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195. First spermatocyte, metaphase.
196. First spermatocyte, equatorial plate.
197. Second spermatocyte, equatorial plates.
_Cicindela primeriana_ (_Family Cicindelidae_).
198. Equatorial plate of spermatogonium, 20 chromosomes--19 large, 1 small.
199. First spermatocyte, spireme stage, _x_ the heterochromosome group.
200. First spermatocyte, prophase.
201. First spermatocyte, metaphase, _x_ the unequal pair in tripart.i.te form.
202. First spermatocyte, showing metakinesis of the heterochromosomes (_l_ and _s_).
203. First spermatocyte, equatorial plate.
204. Second spermatocyte, equatorial plates.
205. Giant spermatocyte, spireme stage, heterochromosome group double the usual size.
206. Giant spermatocyte, prophase.
_Chlaenius aestivus_ (_Family Carabidae_).
207. First spermatocyte, spireme stage, showing the unequal pair a.s.sociated with a large plasmosome.
208. First spermatocyte, metaphase.
209-210. First spermatocyte, beginning of metakinesis.
211. First spermatocyte, equatorial plate, 17 chromosomes.
212. First spermatocyte, anaphase, showing elongated centrosome and diverging univalent chromosomes.
_Chlaenius pennsylvanicus._
213. First spermatocyte, spireme stage.
214. First spermatocyte, equatorial plate, _x_ the unequal bivalent.
215. First spermatocyte, late prophase.
_Galerita bicolor_ (_Family Carabidae_).
216. Equatorial plate of spermatogonium, 30 chromosomes--29 large, 1 small.
_Anomoglossus emarginatus_ (_Family Carabidae_).
217. First spermatocyte, growth stage, _x_ the odd chromosome.
218. First spermatocyte, prophase.
219-220. First spermatocytes, metaphase, _x_ the odd chromosome.
221. First spermatocyte, equatorial plate.
222. First spermatocyte, daughter plates containing 18 and 19 chromosomes, respectively.
223. Second spermatocytes, equatorial plates.
_Elater I_ (_Family Elateridae, species not determined_).
224. Equatorial plate of spermatogonium, 19 chromosomes, _x_ the odd one.
225. First spermatocyte, spireme stage, _x_ the odd chromosome.
226. First spermatocyte, metaphase.
227. First spermatocyte, prophase.
228. First spermatocyte, equatorial plate.
229. Equatorial plate from egg follicle, 20 chromosomes, _x_{1}_ and _x_{2}_ the pair corresponding to _x_ in the spermatogonium.
_Elater II_ (_Species not determined_).
230. Equatorial plate of spermatogonium, 19 chromosomes, _x_ the odd one.
231. First spermatocyte, spireme stage.
232. First spermatocyte, prophase.
233. First spermatocyte, beginning of metakinesis.
234. First spermatocyte, equatorial plate, _x_ the odd chromosome.
235. A pair of second spermatocytes in metaphase, two chromosomes connected, _x_ the odd chromosome.
