CI1AKI.KS V. MOKRILL. 



cysts of second spermatocytes, one finds metaphase groups with 

 eight and seven chromosomes side by side. 



The oogonial groups 7 have not been figured previously, but 

 Wilson gives the number of chromosomes as 16 in the fourth of 

 his "Studies" (096). In Fig. I, a and b, two plates arc shown 



a 



^K. 



h 



J 



FIG. i. Archimerus alternatus. a and b, oogonial, c and d, s 

 metaphase-groups. e-j, first oocyte- (polar) division; e, daughter groups from the 

 same anaphase-spindle, polar view; /and g, anaphase, side view, in two sections; 

 h and i, inner daughter groups, polar view, of two anaphases; j, outer 

 group, polar view, of an anaphase. 



each with 16 chromosomes. A pair of ^/-chromosomes 

 appears in each group. The fourteen larger element^ pir-cnt a 

 somewhat graded series and cannot be paired off readily. T\\<> 



7 The unreduced female groups in all the species, were taken from tin ir^iun In 

 the ovary lying just below the nutritive chamber, where i>".Lr'ini.i. inllii-Ir-i-rll- .i 

 young oOcytes are found together. For convenience they will ! c.illeil "oii 



