5 7 S MOXTG OMER V. 



EXPLANATION OF PLATE XXVIII. 

 Figs. 24<)-2Si : Egg development of Polydora. 



Fig. 249. Nuclear division in a peritoneal cell (alcohol, sol. sublimate ; Ehrl. 

 haematoxylin, i hr. ; eosin, 5 min.). 



Figs. 250-254. Free cells of the body cavity (as in 249). 



Fig. 255. Nuclear mitosis (as in 249). 



Figs. 256-259. Mitoses of genital cells (as in 249). 



Fig. 260. Nuclear mitosis (as in 249). 



Figs. 261-266. Immature ova (as in 249). 



Figs. 267 and 26S. Germinal vesicles (as in 249). 



Fig. 269. Ovum, only a portion of the cytoplasm drawn (as in 249). 



Figs. 270 and 271. Ova (aq. sol. sublimate with 5% acetic acid ; Ehrlich-Biondi 

 stain, 3 hrs.). 



Figs. 272-275. Germinal vesicles (as in 270). 



Figs. 276 and 277. Idem (Perenyi's fluid, I hr. ; Ehrlich-Biondi stain, 2j4 hrs.). 



Fig. 278. Ovum, only a portion of the cytoplasm drawn (Flemming's fluid ; 

 safranin, 70 hrs. ; gentian violet, 2.% hrs. ; orange G, 2 min.). 



Figs. 279-281. Germinal vesicles (as in 278). 



Figs. z82-2g<): Egg development of Tetrastemma elegans. 



Figs. 282-291. Germinal vesicles (alcohol, sol. sublimate; Del. haematoxy- 

 lin, 25 min. ; eosin, 5 min.). 



Fig. 292. Ova (Hermann's fluid ; Del. haematoxylin, 45 min. ; eosin, 5 min.). 

 Figs. 293-299. Germinal vesicles (as in 292). 



