The cellular elements of the Ovary of Platyphylax designatus Walk. 235 



37. C. TöNxiaES, Beiträge zur Spermatogenese und Oogenese der Myriopoden. 



Diese Zeitschrift. Vol. LXXI. 1902. 



38. W. M. Wheeler, The embryology of Blatta germanica and Doryphora 



decemlineata. Journ. Morph. Vol. III. 1889. 



39. H. V. WiELomEJSKi, Über den Bau der Insectenovarien. Zool. Anz. 



Vol. IX. 1886. 



40. Weitere Untersuchungen über die Morphologie und Entwicklungs- 

 geschichte des Insektenovariums. Arbeiten a. d. Zool. Inst, zu Wien. 

 Vol. XVI. 1905. 



41. E. Woltereck, Zur Bildung und Entwicklung des Ostracoden-Eies. Diese 



Zeitschr. Vol. LXIV. 1898. 



Explanation of Plates, 



All figures drawn with a camera-lucida. 

 oö, oöcyte. 

 ec, end Chamber. 

 tf, terminal filament. 



Plate XV and XVI. 



Fig. 1. Ovary A. Lougitudinal section of one of the youngest tubules of 

 this ovary. The terminal filament, tf, is here proportionally larger than in the 

 older ovaries. The stalk which connects the tubule with the oviduct has already 

 a small lumen; only part of the common oviduct, odt, has been drawn, its width 

 should be a little greater than the widest part of the tubule. x 500. 



Fig. 2. Nucleus from one of the cells of the terminal filament; taken from 

 Position 2 of the preceding figure. x 1600. 



Fig. 3. Four marginal cells from ovary A, taken from place 3 in figure 1. 

 X 1600. 



Fig. 4. Four marginal cells from another tubule of the same age in 

 ovary A. x 1600. 



Fig. 5. Four cells from ovary A, taken from position 5 in figure 1. 

 X 1600. 



Fig. 6. Cell from same tubule showing the disappearance of the large 

 chromatin granules and formation of the distinct achromatin Strands, x 1600. 



Fig. 7. Two cells from the proximal end of this same tubule; their 

 Position is shown by figure 6 in the first figure. x 1600. 



Fig. 8. An older tubule of ovary A, drawn without terminal filament, 

 membrane or stalk. D, distal end. The numbers 8 to 12 represent the position 

 from which the five following figures have been drawn. x 500. 



Figs. 9, 10, 11, 12 and 13. Five cells (figure 8 has two cells) from the 

 preceding tubule. The position from which each is taken is represented by the 

 corresponding number in figure 8. x 1600. 



Fig. 14. One of the largest cells in the ovary. x 1600. 



Fig. 15. Ovary B. Lougitudinal section through a tubule of a larva. D, 

 distal end. The letters a to ^, represent different stages in the development of 

 the cells, a, undifFerentiated cell; b, those with large chromatin granules; c, the 



