496 c. II. .MAirrix. 



of the splittini4' of the po.sterior fla;_;elluiii is sliowii. The kinetonucleiis 

 is slightly thicker and the trophonncleus is distinctly enlarged. The 

 intra- nuclear chromatin granules have probably condensed ixpon the 

 karyosome, which no longei' presents the hard outline characteristic of 

 the resting nucleus. 



Fig. 3. — The flagella have now split along their whole length. The 

 karyosome has l.ieconie drawn out into the characteristic dumlj-bell- 

 shape within the nuclear membrane. Corrosive acetic, iron-hajma- 

 toxylin. and eosin. 



Fig. 4. — Tlie l)ody of the animal has become still slioi-ter. Thekineto- 

 nucleus is becoming enlarged and losing its intense capat-ity for 

 nuclear stain. The dividing trophonucleus is almost parallel to the 

 longitudinal axis of the animal's body. Corrosive acetic, iron-hajma- 

 toxylin, and eosin. 



Fig. 5. — The body of the animal has become still more deformed. The 

 basal granules with their Hagella have shifted apart. The kinetonudeus 

 has become tirudcened anil has now lost its intense capacity for nuclear 

 stains, its lowci' Imrder is crossed 1>3' the trophonuclear dumb-bell. 

 Flemming. ha'Uialuni, and eosin. 



Fig. 6. — The basal granules with their flagella now lie at opposite sides 

 of the dividing animal. The lower liml) of the enlarged kinetonudeus 

 has adopted its characteristic position at right angles to the tropho- 

 nuclear dumb-bell. Flemming. ha?mahun. and eosin. 



Fig. 7. — A slightly later stage than the previous figure, showing the 

 characteristic relations of the enlarged kiuetonncleus and the tropho- 

 nuclear duml)-bell. Flemming. hsmalum. and eosin. 



Fig. 8. — A late stage of division. The two products of division are 

 still united liy a l>road band of cytoplasm, through which the kineto- 

 nudeus and trophonuclei still retain their connection. Flemming, 

 hajmalum, and eosin. 



Fig. 9. — A recently divided form showing the characteristic rounded 

 shape, the elongate kinetonudeus. and the unabsorlied strand which had 

 connected the trophonuclei. The full length of the flagella are not 

 shown. Corrosive acetic, luemalum, and eosin. 



