360 ROBERT H. BOWEN. 



PLATB I. 



Fig. 15 is from Brochymena quadripustulata ; Figs. 4 and 6 are from Eu- 

 schistus variolarius ; the others are from Euschistus euschistoides. All the 

 figures are from cells of the small (" normal ") generations except 3, 4, 5, 6 

 and 7. 



FIG. i. Late spermatogonium (or stage a of Wilson ('12)). The Golgi 

 bodies are aggregated around the faintly stained " cap " of mitochondria. 

 (Modified Kopsch.) 



FIG. 2. Late diplotene or early growth period. Fusion of Golgi bodies 

 prior to their migration throughout the cytoplasm. (Modified Kopsch.) 



FIG. 3. Diplotene. Mitochondrial " cap " resolved into threads. (Benda.) 



FIG. 4. Very early growth period. Initial steps in the distribution of the 

 Golgi bodies. (Modified Kopsch.) 



FIG. 5. Early growth period. Distribution of the mitochondria completed. 

 (Benda.) 



FIG. 6. Early growth period. Distribution of the Golgi bodies completed. 

 (Modified Kopsch.) 



FIG. 7. Late growth period. Growth of Golgi bodies almost completed. 

 (Modified Kopsch.) 



FIG. 8. Middle prophase. Slightly oblique polar view of girdle of Golgi 

 bodies. Composite from two adjacent sections of the same cell. (Modified 

 Kopsch.) 



FIG. 9. Late prophase. Lateral view of a part of the ring of dictyosomes 

 encircling the nucleus. (Modified Kopsch.) 



FIG. 10. Late prophase. Polar view of the ring of dictyosomes encircling 

 the nucleus. (Modified Kopsch.) 



FIG. ii. Late prophase. Lateral view. (Benda.) 



FIG. 12. Late prophase. Polar view. (Benda.) 



FIG. 13. Late prophase. Oblique section through one polar field. (Benda.) 



FIG. 14. First maturation division metaphase. (Benda.) 



FIG. 15. First maturation division metaphase. Dictyokinesis completed. 

 (Modified Kopsch.) 



FIG. 1 6. First maturation division anaphase. Composite from two adjacent 

 sections of the same cell. (Benda.) 



