1 68 Edmund B. Wilson 



FIG. 7 

 23-chromosome forms, one supernumerary 



a-h, first division, polar views, one large supernumerary; a-c, term., No. 20, typical grouping; de< 

 gran., No. 48; /, g, h, gran., No. 49 (Photo 5). 



'-/, first division, polar views, one small supernumerary; ;', term. No. i (Photo 6); j-l, term. No. 43 

 typical grouping in k. 



m-p, first division, side-views; m and n (term. No. 43) show division of 7, /', m, and small s; o, term., 

 No. 20, division of I, i, and large s; p, term., No. 43, division of m, i, and small s. 



cf-s, spermatogonial groups from individuals with one large supernumerary; q, r, term., No. 20; s, 

 gran., No. 49. 



t-y, spermatogonial groups from individuals with one small supernumerary; /, u, term., No. 43; 

 v-y, term., No. 2 (Photo 29). 



