PLATE 6 



EXPLANATION OF FIGURES 



43 to 54 From Mermiria bivittata. 



43 Somatic complex of the female with twenty-two free chromosomes and 

 two similar multiples, each containing an accessory chromosome. The euchro- 

 mosomes are all telomitic. 



44 A spermatogonial complex of twenty-two free chromosomes with two 

 unhke V's, in one of which the accessory chromosome betrays its presence by its 

 characteristic granular condition. The other V is smaller and is confined to the 

 male line by always going into the opposite cell from the accessory chromosome 

 in its segregation division. 



45 Another female somatic complex. 



46 Spermatogonial complex. 



47 Pairs of spermatogonial V's in different stages showing disproportion in 

 size. 



48 A female somatic complex — one V foreshortened. 



49 Spermatogonium, V-chromosomes. a and c associated pairs. 



50 a The multiple in first spermatocyte anaphase, lateral view; h, en face; 

 c, as these elements would appear in second spermatocyte metaphase. 



51 Multiples in late first spermatocyte prophase showing the marked dif- 

 ference in appearance between the smooth, homogeneous, condensed accessory 

 chromosome and the yet granular tetrad to which it is joined. 



52 First spermatocyte multiples, h almost fully condensed and showing 

 non-chromatic clefts. These are about in the relative positions of the fiber 

 attachments and the plane of division. 



53 As in figure 51. 



54 Like 52 h. 



