ACCESSORY CHROMOSOME IN EPEIRA. 



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figures are exceedingly numerous, the odd chromosome always 

 being in this relation to the other chromosomes. From the sim- 

 ilar shapes and positions of the ordinary chromosomes on the 

 spindle, as compared with those described by other observers, I 

 should say that the first division in Epeira is a reduction division 

 and the second an equation-division, but I have not yet studied 

 for this point and have no new evidence to offer. 



FIG. 3. Second spermatocyte-division % ; a, b, spindles, side-view, c late ana- 

 phase ; all of the chromosomes not pictured in b and c ; rf, g, metaphase-figures, 

 showing eleven chromosomes ; e, h, metaphase-figures, showing twelve chromo- 

 somes ; /, i, telophases /showing presence and equal distribution of odd chromo- 

 some, i showing absence of odd chromosome. 



Fig. 2, dg, represents first division polar metaphases showing 

 the eleven ordinary chromosomes and the odd chromosome, 0, 

 which can always be recognized by its different level. 



Fig. 2, c, represents a first division telophase, showing the odd 

 chromosome in but one of the daughter cells (o, in the upper 



