Studies on Chromosomes 183 



are clearly shown it may be inferred that the somatic number is 27. 

 The chromosome-nucleoli in this individual are evidently com- 

 pound, but in no case can all the components be clearly recognized. 

 The second division shows, as a rule, n elements in polar view, 

 the central one being compound (Fig. 13, j-k), but the distribu- 

 tion of the compound element could not be determined. 



l*li v*: **v 



*, ^ *, * ^ 5 * 



abed 



ff *+.*? 



e *** f g *~h 





T- %> , 



/ J W k 



FIG. 13 



27 and ( ?) zS-chromosome forms 



a-i, first division, from gran., No. 57, having four large supernumeraries and one small j (polar) 

 and k (side-view), second division, same individual (Photo 10). 



/, ovarian group from fern., No. 33, having three large and two or three small supernumeraries; in 

 this group appear 28 chromosomes. 



8 Individuals with twenty-eight (?) Chromosomes; six 

 Supernumeraries. 



The last case to be considered is that of a single female of femora- 

 tus (No. 33), in which the number is either 27 or 28. A single 

 perfectly clear ovarian group, shown in Fig. 13, /, shows beyond 



