STUDIES ON CHROMOSOMES 



59 



d 



4J* A 



% * w *-* , * 



' 



>6 



I 



; 



>i' 



Fig. 2 a, late prophaseNo. 64, spindle forming; b, metaphase of same in side 

 view; c, late prophase of M. femoratus, No. 29 (22 chromosomes), for comparison 

 with a; d-g, first division metaphase, polar views, No. 64; h, i, similar views of 

 M. terminalis, No. 3 (Montgomery's material), with 21 chromosomes;./, similar 

 view of M. femoratus, No. 29 (22 chromosomes); k, similar view of M. terminalis, 

 No. 43 (23 chromosomes), with one small supernumerary, for comparison. 



the early anaphase are more or less clearly quadripartite, and sep- 

 arate into bipartite daughter chromosomes connected by conspic- 

 uous double fibers (figs. 4, b-h) but true tetrads (such for instance, 

 as those observed by Levfere and McGill in Anax, '08) are rarely 

 if ever seen. The quadripartite form, though very characteristic 

 of this division, is by no means invariable in case of the large 

 bivalents, and has not been seen in case of the eccentric odd 

 chromosome. 



