II 



MEIOSIS IN LEPIDOSIREN 



39 



conjugation of the chromosomes. Hence the word synizesis was proposed 

 for the contraction, and syndesis for the chromosome conjugation. 



M 



Fig. i6a. 



Meiosis in Lepidosiren (male . (Asrar, Q.J. M.S., igri.) H, diplotene staRC and beginninR of synirtsis; 

 I, synizesis further advanced; J, synizesis breaking up; K, diakinosis, showing that the bivalonts whicJi 

 were formed in the zygotene stage are completely resolved into their univalent constituents ; L, iinniediatc 

 prophase of the meiotic division, showing the univalents pairing again; M, early anaphase I. 



Unfortunately, however, cytologists are not agreed in tlieir use of the 

 alternative words. Some continue to use the term synapsis for the 



