^76 MONTGOMER Y. 



EXPLANATION OF PLATE XXVII. 

 Figs. 2ij-2j^ : Egg development of Siichostemma eilhardi. 



Fig. 213. Portion of the cell syncytium of an immature gonad (aq. sol. sub- 

 limate ; aq. sol methylen blue, 5 min. ; brasilin, 20 min.). 



Fig. 214. Germinal vesicle (as in 213). 



Fig. 215. Yolk balls (as in 213). 



Fig. 216. Germinal vesicle (as in 213). 



Figs. 217 and 218. Portions of cell syncytia of gonads (as in 213). 



Fig. 219. Germinal vesicle (aq. sol. sublimate; Del. haematoxylin, 15 min.; 

 borax carmine, 20 hrs.). 



Fig. 220. Portion of the cell syncytium of a gonad (aq. sol. sublimate ; 

 Ehrlich-Biondi stain, 3 hrs.). 



Figs. 221-223. Germinal vesicles (as in 220). 



Figs. 224-227. Idem (Flemming's fluid; alum carmine, 24 hrs.). 



Fig. 228. Portion of a gonadal syncytium (aq. sol. sublimate ; Del. haema- 

 toxylin, 15 min.; alum carmine, 22 hrs.). 



Figs. 229 and 230. Germinal vesicles (as in 228). 



Fig. 231. Germinal vesicle (aq. sol. sublimate; Del. haematoxylin, 15 min.; 

 alum carmine, 45 hrs.). 



Fig. 232. Idem (aq. sol. sublimate ; picrocarmine, 22 hrs.). 



Fig. 233. Ovum, only a portion of the cytoplasm drawn (Lang's fluid ; alum 

 carmine; Del. haematoxylin, 15 min.). 



Fig. 234. Germinal vesicle (aq. sol. sublimate ; Del. haematoxylin, 15 min. ; 

 alum carmine, 16 hrs.). 



Fig. 235. Germinal vesicle and portion of the cytoplasm (aq. sol. sublimate ; 

 Del. haematoxylin, 15 min. ; alum carmine, 24 hrs.). 



Figs. 236-248 : Egg development of Zygonemertes virescens. 



Figs. 236-241. Germinal vesicles (aq. sol. sublimate ; Del haematoxylin, 20 

 min. ; eosin, 5 min.). 



Figs. 242 and 243. Idem (aq sol. sublimate ; Ehrlich-Biondi stain, 3 hrs.). 



Figs. 244 and 245. Idem (alcohol, sol. sublimate ; picrocarmine; Del. hae- 

 matoxylin, 20 min. ; eosin, 5 min.). 



Fig. 246. Portion of an ovum (as in 342). 



Figs. 247 and 248. Germinal vesicles (as in 242). 



