128 



FERNANDUS PAYNE. 



masses of chromotin condensing to form the remaining chromo- 

 somes. 



c 



FIG. 3. Rocconota annuliconiis Stal. ^/ and B, male chromosome-groups, 27 

 chromosomes ; C and D, polar views of the first spermatocyte division, showing 15 

 chromosomes the three small ones are the differential chromosomes : E and F, 

 polar views of the second division only two of the three differential chromo- 

 somes are shown, as the third lies below the two ; G and H , side views of the 

 second division metaphase, showing arrangement of the triad group of differen- 

 tial chromosomes ; I and 7, two anaphases of the second division taken from the 

 same spindle, which show the manner of separation of the triad group ; K, a 

 stage in the early growth period, showing the pale plasmosome and the three dif- 

 ferential chromosomes embedded in it : L, a stage giving the typical appear- 

 ance of the nucleus during the greater part of the growth period ; M, prophase 

 of the first division the plasmosome has disappeared and the three differential 

 chromosomes are easily recognizable. K. L and M are magnified 2,411 

 diameters ; the remainder 3,726 diameters. 



