A Comparative Study of the Cliromosomes etc. 
297 
Figs. 170 — 174. Siiccessive stages in the Separation of the daughter chroinosoincs. 
Fig. 173. Polar view of anaphase group seen in stage corresponding to Figure 172. 
Fig. 175. Telophase group of chromosomes betöre they lose their Condensed 
condition. 
Figs. 176 — 178. Spermatids of E. hinotata from smear preparations. The allo- 
some (a: or y) remains Condensed. 
Fig. 179. Spermatid of E. hinotata from a section. The allosome {x or ]]) plaiidy 
^■isible. 
Figs. 180 — 190. Second spermatocyte division of Enchenopa 
curvata. 
Fig. 180. Metaphase seen in polar view. ATne-cluomosome cell. 
Fig. 181. Metaphase of ten cliromosomes, second spermatocyte. 
Figs. 182 — 184. Consecutive sections of metaphase. Lateral view. Aine-chromo- 
some cell. 
Fig. 185. Section showing lateral view of metaphase, and the broad macro- 
chromosome. 
Figs. 186 — 187. Chromosomes of anaphase showing two corresponding groups 
of chromosomes. Sections are from one cell cut through the equator. 
Fig. 188. Double second spermatocyte with nineteen chromosomes. 
Fig. 189. Spermatid with j-chromosome. 
Fig. 190. Spermatid without a:-chromosome. 
Figs. 191 — 198. Thelia himaculata. 
Fig. 191. Metaphase of spermatogonium, polar ^'iew, showing the large x-chio- 
mosome. 
Fig. 192. Metaphase of oögonium, polar view, showing two large a:-chromosomes. 
Figs. 193 — 194. Growth period of spermatoccdes. 
Fig. 195. Metaphase of first spermatocyte diidsion, polar view. 
Fig. 196. Same in lateral view. 
Fig. 197. Anaphase of first spermatocyte division, the ar-cliromosome lagging. 
Fig. 198. Late anaphase of first spermatocyte and the passage of the rr-element 
to the upper of the two poles. 
Fig. 199. Spermatid showing the large Condensed x-chroniosome. 
Plate XXII. 
Figs. 200 — 210. Enchenopa hinotata. 
Diagrammatic representation of the behavior of the allosomes and autosomes 
during the growth period and divisions of the spermatocytes. The macrochromosome, 
one pair only of the smaller autosomes and the allosome (xy) are represented. 
As described in Part B (p. 284) of “Discussion”, sohd black = “autochromatui” ; 
white (i, e. outlines only) = “a:-chiomatin” ; small circles = “^-chromatin” ; dots = linin. 
Fig. 200. Bouquet stage, x and y united end to end. 
Fig. 201. Löss of polar aivangement; x and y laterally approximated. 
Fig. 202. Strepsistene stage; x and y separated along their lengths; autosomes 
twisted aroimd each other. 
Figs. 203 — 204. Contraction of the xy pah’ and formation of the autosome gemini. 
Fig. 205. Metaphase of first spermatocjde. 
