306 N. M. Stevens. 



Fig. 14. Older ovary, showing sperm-duct tissue (sd). 2 mm. -4. 



Fig. 15. Longitudinal section through the antrum region before the external 

 opening (p) has become functional. Same stage as Fig. 14. 2 mm. -4. 



Fig. 16. Crescent-shaped oviduct, showing an opening (od) between the sperm- 

 duct tissue {sd) and the median wall. 2mni.-4. 



Fig. 17. Oviduct and sperm-duct contracted laterally. 2 mm. -4. 



Figs. 18-20. Sperm-duct, showing development of lumen (1). 2 mm. -4. 



