Munson. — Spermatogenesis of Papilio. 
Fig. 40. 
Fig. 41. 
Fig. 42. 
Fig. 43. 
Fig. 44. 
Fig. 45. 
Fig. 46. 
Fig. 47. 
Fig. 48. 
Fig. 49. 
Fig. 50. 
Fig. 51. 
Fig. 52. 
Fig. 53. 
Fig. 54. 
Fig. 55. 
PLATE 14. 
Spermatocyst with spermatids forming first stages of spermatozoa. 
Spermatocyst with spermatids growing into spermatozoa — from 
Grapta silenus. 
Section through the head nurse-cell showing insertion of the heads 
of spermatozoa. Cf. fig. 43. 
Spermatocyst with developed spermatozoa. 
Section of head end of spermatocyst showing relation of sperma¬ 
tozoa to the head nurse-cell. 
Bundle of developed spermatozoa imbedded in gonocyst. 
Part of section of spermatocyst showing development of giant sper¬ 
matids into spermatozoa. 
Transverse section of a developed spermatocyst represented in figure 
45, and showing section of the heads of spermatozoa. 
Section of head end of developing spermatocyst showing extension 
of nucleus, and imbedding of centrosome (c.). 
Section of spermatocyst showing early stage in development of head 
nurse-cell. 
Section of spermatocyst showing early development of head nurse- 
cell, and a spherical sperm nucleus. 
Mature spermatocyst showing its gradual absorption and libera¬ 
tion of spermatozoa. 
Transverse section of the body of a spermatocyst represented in 
figure 43. 
Bundles of free spermatozoa in testis, recently discharged from cyst. 
Section of head end of spermatocyst with fully developed sperma¬ 
tozoa. 
Section of vas deferens showing secreting epithelium and bundles 
of spermatozoa recently arrived in the proximal end of vas deferens. 
