The Chromosome Cycle in Coccidia and Gregarines. 



89 



I 



K L M N 



Fig. 2. — Chromosomes of Diplocystis schneideri. 



The figures are tracings from drawings made with the camera lucida at a magnification 

 of 2500 diameters. Only the chromosomes are exactly figured ; the other structures are 

 semi-diagrammatic. 



A. Early stage in first division of gamont nucleus. Chromosomes lying upon residual 

 karyosome. The aster is also indicated. B. Metaphase of first division. C. Anaphase 

 (late) of first division. D. Metaphase of later division, viewed from pole. E. Anaphase 

 of later division. F. Equatorial plate stage of early peripheral division. G. Early 

 anaphase of late peripheral division, immediately previous to gamete formation. H. Pro- 

 phase (diakinesis) of first division in zygote (sporoblast). K. Anaphase of first division 

 in zygote (spore). L. Early telophase of first division in spore. M. Anaphase groups at 

 second division in spore. N. Anaphase groups at third division in spore. 



VOL. LXXX1X. — B. 



H 



