HISTORY OF CHROMOSOMAL VESICLES IN FUNDULUS. 273 



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Nudibranch eggs. Telophase vesicles which later fuse. 



Unio eggs. 



Crepidula eggs. 



Cyclops eggs. 



Cyclops eggs. 



Daphina 



parthenogenetic 



eggs. 

 Cyclops eggs. 



Lepas eggs. 



Brachystola 



spermatogenesis . 



Locusta spermato- 

 genesis. 



Locustidce and 

 A cridid(B, 

 spermatogenesis. 



Phrynotettix 

 spermatogenesis. 



Oncopdtiis 



spermatogenesis. 



Phrynotettix 



spermatogenesis, 



Figure of resting nucleus yet in re- 

 constructing process shows vesi- 

 cles. 



Experimentally produced karyo- 

 meres from single chromosomes. 



A few small vesicles which are male 

 and female contributions. 



Chromosomal vesicles in both male 

 and female halves, in transition 

 to resting stage. 



Vesicles in telophase, but they do 

 not prove continuity for they are 

 unrecognizable during rest. 



Figures vesicles in four-cell stage. 



Figures show vesicles in early cleav- 

 age stages. 



Chromosomal vesicles which became 



fused at one end. 

 Chromosomal vesicles which were 



thought to remain distinct. 

 Vesicles fuse at one end. 



Vesicles which were thought to re- 

 main distinct through resting 

 stage. 



No rest between maturation divi- 

 sions; chromosomes crowd to- 

 gether, like vesicles, without loos- 

 ening up; never fuse. 



Vesicles retain their own limits in 

 the nucleus in rest. 



Scutigera forceps Vesicles in second spermatocyte; 

 spermatogenesis. they fuse; but traces are often 



long retained. 

 Cynthia eggs. Vesicles in cleavages. 



Eggs of Fundidus Vesicles which fuse, but believed to 



and Menidia 

 crosses. 

 Fundulus and 

 Ctenolabrus 

 crosses. 



be distinct though invisible as 

 such in rest. 

 Vesicles which fuse. 



