Studies on Chro??Tosomes 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 show^s, as a rule, 11 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. 



• 



•5: t**'t: v'».. .-%.» 



abed 



7mf: 





%t 



t*.. 



f g ^ h 





Fig. 13 



27 and ( ?) 28-chromosome forms 



a-;', 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 fem., 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 



