PLATE 9 



EXPLANATION OP FIGURES 



114 to 124 First spermatocyte prophase from Mermiria; 114 to 113, X 525, 

 from sections; 119 to 124, X 875, from sections, except figures 122, 123. 



114 Fragment of ring with the opening at the synaptic point. 



115 A complete ring with the synaptic ends well drawn out and showing the 

 extension of the ring cleft into these arms. 



116 Another view of a ring chromosome. 



117 A rod-shaped chromosome. 



118 Oblique view of ring. 



119 Oblique view of ring showing split extension. 



120 View of a cross, en face. 



121 Lateral view of a ring showing its division into super-imposed rings. 



122 Rings and double rings; the lower chromosome presents clearly the 

 structure of the double rings and shows that they are not merely looped structures. 



123 Various rings in late prophase. 



124 Lateral view of ring. 



125 to 128 Prophase chromosomes of Phrynotettixmagnus; sections. X 875. 

 125 and 126 Show the unequal tetrad U at successive stages of development 



(see fig. 88). 



127 Oblique view of a ring. 



128 Bent rod. 



129 to 133 Views of first spermatocyte metaphase complexes of Mermiria; 

 sections. X 525. 



129 The upper cell shows a polar view of a complex with perichromosomal 

 clear spaces, and with the centrally placed synaptic ends of the ring chromosomes 

 dark. 



130 Upper cell as in figure 129; in the lower cell a lateral view of one ring. 



131 In the upper cell a rod shaped chromosome, en face, with central opening 

 indicated. 



132 Polar view of first spermatocyte metaphase of Mermiria showing clearly 

 the rings and V's lying in the plane of the equatorial plate. 



1.33 Oblique view of a ring in the upper cell demonstrating the symmetrical 

 position of the synaptic extension with reference to the two sides of the ring 

 (cf. fig. 127). 



134 to 138 From the Stendbothrus-like form; sections. X 875. 



134 Polar view of spermatogonial metaphase showing chromosomes with 

 terminal and subterminal fiber attachments. 



135 Lateral view of first spermatocyte metaphase in which a ring composed 

 of two spermatogonial chromosomes with subterminal attachments is separating 

 into these two elements. The longitudinal cleft is apparent in the disjoined ends. 



136 Lateral view, as in figure 135, showing other forms of chromosomes. 



137 Polar view of second spermatocyte metaphase showing chromosomes with 

 terminal and subterminal attachments. 



138 Upper cell as in figure 137; lower cell, lateral view. 



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