Plate I. 



Fig. 1. Terminal chamber, t. f., sections of terminal filament ; a., degen- 

 eration space ; e., egg cell ; n., nurse cell ; y. d., yolk duct ; f. c, follicle cells. 

 X 500. 



Fig. 2. Two egg cells from distal end of terminal chamber. The lower one 

 shows two nurse cells in a chain of yolk duct attachment. The nurse cells 

 so attached to the egg cell do not indicate secretion activity, y. d., yolk 

 ducts. X 10<^0. 



Fig. 3. An older egg cell. The chromatin of the nurse cell having a yolk 

 duct now shows a marked contrast with other nurse cells, v., vacuole. 

 X 1,000. 



Fig. 4. Later stage than preceding, x 1,000. 



Fig. 5. The yolk duct about to break permitting the final nurse cell to enter 

 the nurse follicle, ch., chorion, x 1,000. 



Fig. 6. Completed nurse and egg follicles, e. n., egg nucleus ; m. n., migrated 

 nuclei. X 500. 



Fig. 7. Distal end of terminal chamber showing degeneration features, a. 

 and b. ; t. f., cells of terminal filament, x 1,000. 



Fig. 8. Group of migrated nuclei. X 1,000. 



Fig. 9. Amitoses of migrated nuclei, x 1,000. 



Note. — Figs. 2-9 drawn with Zeiss camera lucida, Zeiss comp, eye-piece 

 No. 6, Zeiss apochrom. 1.5. Figs. 1 and 10 were drawn with Bausch & Lomb 

 camera lucida ; B. & L. eye-piece No. 1 and 1-6 and 2-3 objectives. 



