Ookinesis in Ceivbratulus Lacteus. 



377 



'99), in Ulujuchchnis-'' (Vcjdovsky and Mrazek, '03); that of Tha- 

 lassema (Griffin, '96, '99) may belong to this type {vide infra). 



II 





r A 



III 



i^-' 





^ :W'i 



IV 



© 



Fig. B. Diagram showing various types of the forniution of daughter 

 centrosonies from a single original one. 



B. Formation of daughter centrosome by moulting (Vejdovsky, 

 '88, Vejdovsky and Mrazek, '03). Disagreeing with Boveri's view 

 of reduction of the C£ntro5onio, \"ejdovsky and Mrazek maintain that 

 a daughter centrosome arises within the old one, and a grand- 

 daughter centrosome within the daughter and so on. like a series 

 of ring waves as aptly expressed by His ('98, p. 442-443). They deny 

 Boveri's conclusion on the ground that the daughter centrosome is a 



""In this form tlic centriolos acfinii-c new ray-syslems before tlie division of 

 tile centrosome. 



