REPRODUCTION 



211 



flagella, are all absorbed and replaced by new combinations in each 

 of the daughter cells. Thus in Spongomorias splendida, according 

 to Hartmann and Chagas (1910) the old blepharoplasts and the two 

 flagella are absorbed and new ones are derived from centrioles of 

 the nuclear division figure (Fig. 59, p. 117). The same phenomenon 

 is described for Polytonia urella (I)angeard, P^ntz), for Chlamijdo- 

 monas (Dill, see Oltmanns) and Parapolytoma saturna (Jameson). 

 The phenomenon cannot be regarded as typical of the simple flagel- 

 lates, for in the great majority the kinetic elements are self-per- 





Fig. 96. — Scytomonas suhtilis, hologamic copulation. .1, normal adult iiidividual 

 B to F, successive stages in fusion, loss of flagella, and encystnient. (After 

 Dobell.) 



petuating, even the axostA'les according to Kofoid and Swezy (1915) 

 dividing in Trichomonas (Fig. 72, p. 139). This, however, is not 

 supported by Wenrich (1921). 



An extreme case of reorganization is apparent in the two species 

 of Lophomonas (L. hlattoB and L. striata) first described by Janicki 

 (1915). Here the parental calyx, basal bodies, blepharoplasts and 

 rhizoplasts all degenerate during division (Fig. 9S). At division a 

 cytoplasmic centriole first divifles with a connecting fibril which is 

 retained throughout as a paradesmose. The nucleus emerges from 



