CHROMOSOMES OF ACHOLLA MULTISPINOSA. 1 75 



wish to state that with this point in mind, Van Duzee has ex- 

 amined my material very carefully and that the larger part of it 

 (30 specimens) consisting of both males and females was collected 

 within a small circular area of about 200 feet in diameter. 



• 



••i- %••• ••?•• 



;? * B * C 







.••• 



£•<;:•• •ifj^ •-• 



•..> 



/ 



c> c** 4,:* 



Fig. i.^ Acholla midtispinosa. A, B, C and U, metaphase figures of the 

 oogonial division, showing 30 chromosomes \ E, F, G and H, spermatogonia! divi- 

 sions showing 26 chromosomes ; /, J, A' and Z, metaphase figm-es of the first matura- 

 tion division showing 1 6 chromosomes. 



The metaphase plate of the first spermatocyte-di vision shows i6 

 chromosomes (Fig. i, I, J, K and L). As 26 is the spermato- 



1 All figures are drawn to the same scale and magnified 1,500 diameters. 



