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SurTon, W. S., 03. The Chromosomes in Heredity. Biol. Bull., vol. IV. 
Witcox, E. V., 95. Spermatogenesis of Caloptenus femur-februm and 
Cicada tibicen. Bull. Mus. Comp. Zool., Harvard Univ., vol. 27. 
Witson, E. B., 02. The Cell in Development and Inheritance. New 
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EXPLANATION OF PLATES. 
All drawings made with a 12 ocular, one-twelfth oil immersion obj. 
and Abbe camera lucida; reproduced at a magnification of about 2000 
diameters. Drawings are arranged in the order of their development as 
nearly as possible, beginning with spermatocytes and ending with 
spermatogonia. Figures 1-65, plates 28, 29, 30, represent Melanoplus 
femur-rubrum; plate 31, Melanoplus differentialis; and plate 32, figures 
1-12, Melanoplus atlanis, figures 13-24, Melanoplus packardit. 
2—Univ. Sci. Bull., Vol. VI, No. 7. 
