Munson. — Spermatogenesis of Papilio. 
PLATE 13. 
Drawn with camera, obj. oc. 1, oil immersion. 
Fig. 24. Gonocyst, showing spermatogones at rest. 
Fig. 25. Gonocyst with spermatogones in synapsis stage. 
Fig. 26. Gonocyst with spermatogones in the spireme stage. 
Fig. 27. Gonocyst showing spermatogones just before the formation of 
spindle. 
Fig. 28. Gonocyst with dividing spermatogones, anaphase. 
Fig. 29. Gonocyst with spermatogones much older than the preceding, in 
various phases of mitosis. 
Fig. 30. Gonocyst with spermatogones in metaphase of karyokinesis. 
Fig. 31. Gonocyst with spermatogones in telophase of karyokinesis. 
Fig. 32. Gonocyst with spermatogones showing pseudonebenkern. 
Fig. 33. Degenerating spermatogone. 
Fig. 34. Various phases of mitotic division of spermatocytes first order. 
Fig. 35. Resting spermatocytes first order of Grapta silenus. 
Fig. 36. Spermatocytes preparing for the first*maturation division. 
Fig. 37. Spermatocyst with prophases and metaphases of first maturation. 
Fig. 38. Spermatocytes in first maturation division, telophase. 
Fig. 39. Part of spermatocyst showing giant spermatids. 
Fig. 39a. Newly formed spermatids showing nebenkern. 
