1910.] NATURAL SCIENCES OF PHILADELPHIA. 325 



Fig. 49 — Second spermatocyte, Equatorial plate, 19 chromosomes. 

 Fig. 50 — Second spermatocyte, metaphase spindle. 

 Figs. 51 and 52 — Second spermatocyte, anaphase spindle. 

 Fig. 53 — Second spermatocyte, telophase. 

 Fig. 54 — Spermatid, first stage, chromatin granule present. 

 Fig. 55 — Spermatid, degenerating. 



Fig. 56 — Spermatid, first stage showing chromatin granule, ciliated cen- 

 trosome and chromatin nucleolus. 

 Figs. 57 and 58 — Spermatid, second stage. 

 Fig. 59 — Spermatid, formation of axial filament. 

 Figs. 60 and 61 — Spermatid, later stages. 



Plate XXIV — Telea polyphemus — Fig. 62 — Early spermatogonial stage, showing 

 net knot. 



Fig. 63 — Late spermatogonial stage. 



Figs. 64 and 65 — Spermatogonial spireme. 



Fig. 66 — Spermatogonial, equatorial plate, probably 60 chromosomes. 



Figs. 67 and 68 — Last spermatogonial, division. 



Fig. 69 — Spermatogonial telophase (oblique section). 



Fig. 70 — First spermatocyte, spireme preparatory to synizesis. 



Fig. 71 — First spermatocyte, beginning of synizesis. 



Fig. 72 — First spermatocyte, synizesis of smear preparation. 



Fig. 73 — First spermatocyte, synizesis. 



Fig. 74 — First spermatocyte, coming out of synizesis. 



Fig. 75 — First spermatocyte, early post-sjmapsis , showing plasmosome. 



I ig. 76 — First spermatocyte, late post-synapsis. 



Fig. 77 — First spermatocyte, fading of spireme. 



Fig. 78 — First spermatocyte, growth stages. 



Fig. 79 — First spermatocyte, ciliated centrosomes. 



Fig. 80 — First spermatocyte, segmented spireme, showing plasmosomes. 



Fig. 81 — First spermatocyte, segmented spireme, showing split. 



Figs. 82-85 — First spermatocyte, showing various stages in prophase. 



Fig. S6 — First spermatocyte, early metaphase. 



Fig. 87 — First spermatocyte, equatorial plate, 30 chromosomes. 



Fig. 88 — First spermatocyte, metaphase spindle, showing "chromosome 

 granule." 



Fig. 89 — First spermatocyte, anaphase. 



Figs. 90 and 91 — Second spermatocyte, rearrangement of chromosome for 

 second division. 



Fig. 92 — Second spermatocyte, equatorial plate, 30 chromosomes, "chro- 

 matin granules." 



Fig. 93 — Second spermatocyte, anaphase. 



Fig. 98 — Second spermatocyte, telophase, showing zwischenkorper and 

 chromatin granules. 



Fig. 94 — Spermatid, early stage. 



Fiu r . 95 — Spermatid, second stage. 



Figs. 96 and 97 — Spermatid, later stage, formation of axial filament. 



Fig. 191 — Ciliated centrosome (Danais archippus). 



Fig. 192 — Ciliated centrosome (Papilio cresphontes). 



Plate XXV — Automeris io — Fig. 98a — Early spermatogonial rest stage. 

 Fig. 99 — Later spermatogonial rest stage, showing curious net-knot. 

 Fig. 100 — Spermatogonial metaphase. 

 Fig. 101 — Spermatogonial anaphase. 

 Fig. 102 — Spermatogonial telophase. 

 Fig. 103 — First spermatocyte, going into synizesis. 

 Fig. 104 — First spermatocyte, later stage. 

 Fig. 105 — First spermatocyte, complete condensation. 

 Figs. 106 and 107 — First spermatocyte, early post synapsis. 

 Fig. 108 — First spermatocyte, later post-synapsis showing plasmosome. 

 Fig. 109 — First spermatocyte, growth stage, double plasmosome, ciliated 

 centrosome. 



