178 Edmund B. Wilson 



FIG. n 



24-chromosome forms, two supernumeraries. 



a-e, term., No. 21, first polar, showing various groupings; g, the same, gran., No. 52 (Photo 7). 



h, term., No. 21, second polar, tetrad element near center. 



i-o, somatic groups from individuals with two large supernumeraries; /-/, spermatogonial groups 

 from term. No. 21; m, n, ovarian groups from fern. No. 3150, ovarian group, fern., No. 45. 



p-r, spermatogonial groups from fern., No. 22, with one large supernumerary and one small; Photo 

 30). 



s-w, second division, side-view; s t term., No. 21 ; t-w, gran., No. 52 (Photo 21). 



