PLATE 8 



EXPLANATION OF FIGURES 



102 to 104 Successively later stages in the formation of the prophase chromo- 

 somes of Brachystola magna. The gradual opening out of the rings is here shown. 

 Smear preparations. X 875. 



105 Prophase of Mermiria, with a ring near the center of the figure. X 875. 



106 and 107 Two views of the same first spermatocyte metaphase of Mecoste- 

 thus lineatus. In figure 106 a chromosome elongated in the spindle axis is shown, 

 in figure 107 another chromosome lying in the equatorial plate, with the synaj^tic 

 ends extended; section. X 875. 



108 Late prophase of Trimerotropis maritima. The lower chromosome is 

 a double ring showing the divergence of the halves of the primary ring (at the left) 

 to form the secondary ring; smear. X 875. 



109 Polar view of first spermatocyte metaphase of Mecostethus showing the 

 uniformity of chromosome form; this cell is also drawn in figure 34; section. 

 X 875. 



110 View of similar stage in Tropidolophus; see also figure 29 for a drawing 

 of this cell; section. X 875. 



111 to 113 Metaphase complexes of Hippiscus from smears. In this species 

 one ring is always provided with the elongations terminating in knobs, from the 

 synaptic ends, to which the fibers attach. X 875. 



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