04 



The details of tlxe orcanii:ation of tlie spindle are 

 made out with difficulty, Dui^ing prophase, kinoplas:nic 

 caps e,re formed at the poles of t}ie nucleus l^y differenti- 

 ation of cytoplasm at these points. In most cases, at the 

 centre of each kinoi'ilas.vlic mc.ss is a darkly sta,ining body 

 (fig, 124) prohahly comparable to the "centrosphere-like 

 structiu'es" of Polys iphonia YALIAITOUCHI , '06h) . In some 

 cases these are large and prominent; in others they could 

 not be demonstrated e.t all. They are certainly not perms.- 

 nent structui^es; tliey seem rather to be t]ie expressions of 

 some temporary kinoplasmc activity. To them the spindle 

 fibres are attached. The spindle is entirely intranuclear, 

 and is probably differentiated from materials v/ithin the 

 nuclear cavity, as no evidence has been seen to indicate 

 that the fibres grow in from . ithout, as is the case in 

 Spirogi'ra (BEEOHS, '06). The spindle is truncate at the 

 poles and slightly broader at the equatorial plate (figs. 

 124,125), The chromosomes, •.:hich lay scattered in the nu- 

 cleajr cavity before the formation of the spindle, now move 

 in toHard the centre of tlie nucleus, (fig, 126a). H^re 

 they become arranged on the equatorial plate. Some prep- 

 arations (fig, 126) seem to indicate that during tliis pro- 

 cess they become associated in pairs, -..Mch soon sepa,rate; 



