MEIOSIS IN LEPIDOSIREN 



39 



conjugation of the chromosomes. Hence the word symzesis was proposed 

 for the contraction, and syndesis for the chromosome conjugation. 



FIG. i6a. 



Meiosis in Lepidosiren (male . (Agar, Q.J.M.S., 1911.) H, diplotene stage and beginning of synizesis; 

 I, synizesis further advanced ; J, synizesis breaking up ; K, diakinesis, showing that the bivalents which 

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

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



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

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



