366 THOS. H. MONTGOMERY, 



Figs. 223 — 225. Giant spermatogonia, lateral views ot successive 

 anaphases, in 223 and 224 the poles of the spindle not visible. 



Fig. 226. Giant spermatogonium, anaphase, oblique lateral view, 

 so that the nucleus is seen on high, the Zwischenkörper on deep, focus. 



Fig. 227. Giant spermatogonium, degenerated anaphase ; x a meta- 

 morphosed mass of chromatin (?). 



Fig. 228. Ovogonium from the wall of an ovary, pole view of 

 monaster showing 28 chromosomes ; cell details not drawn. 



Fig. 229. Entoderm cell of an embryo in oviduct, pole view of 

 monaster, all (28) chromosomes shown ; cell details not drawn. 



Figs. 230, 231. Two sections, including all the chromosomes, of 

 a stalk cell of the ovary, prophase ; the thickness of the chromosomes 

 is somewhat too pronounced. 



Fig. 232. Ectoderm cell of embryo in oviduct, prophase of monaster. 



Fig. 233. Portion of transverse section of wall of testis, the outer 

 layer of spermatogonia shown only in outline. 



Fig. 234. Portion of obliquely transverse section of wall of testis, 

 the outer layer of spermatogonia given only in outline. On the surface 

 of the yolk cell layer ( Yk. G) a portion of a blood cell {? B. C) 

 pseudoepithelium, with one nucleus in rest and one in mitosis (this 

 with apparently 26 chromosomes). 



Fig. 235. Paratangential section of a yolk cell from wall of testis ; 

 nucleus with great amount of nucleolar substance ; cytoplasm with 

 nutritive globules which are not shown. 



Fig. 236. Surface view of yolk cell of testis sheath. 



Fig. 237. Surface view of two yolk cells, and A of a nucleus of 

 another cell, from the testis sheath. 



Fig. 238. Portion of transverse section of wall of testis, spermato- 

 gonia shown in outline ; the mitosis is apparently in a yolk cell. 



Figs. 239, 240. Portions of cytoplasm of 2 yolk cells, from the 

 testis sheath. 



Fig. 241. Portion of paratangential section through muscle sheath 

 of testis, muscle cell nuclei shown only in outline; the arrow marks 

 the transverse axis of the testis. 



Fig. 242. Paratangential section of 2 muscle bundles from testis 

 sheath, on the lower one the outline of a nucleus. 



Plate 24. 



Fig. 243. Portion of transverse section of the wall of the vesica 

 seminalis. 



Fig. 244. Longitudinal section of a fibre cell of testis; the left 

 end of the cell connects with the sheath of the testis. 



Fig. 245. Portion of fibre cell, and outlines of 2 spermatocytes; 

 the left end of this cell extends into the central lumen of the testis. 



Fig. 246. Portion of transverse section of wall of the abnormal 

 seminal vesicle shown in Fig. 247. 



