Studies in Spermatogenesis Volume Ii Part 7

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.