DEVELOPMENT OF THE GENERATIVE ORGANS. 705 



substance of the ovaria excentrically on their convex surfaces 

 near their inner margins. This is more readily observed at a 

 later stage, as in the earlier stages the ovaries are so friable 

 that only portions of the egg-tubes were seen adherent to the 

 extremity of the parovarium. 



The Parovaria are in a very advanced stage of development 

 on the seventh day in the pupa. They exhibit two distinct 

 parts : a duct lined with small columnar cells, about "5 mm. in 

 length, and a glandular portion 1*5 mm. in length, widest 

 towards its csecal end, where it is about 'i mm. in diameter. 



FlG. 101. The oviducts and parovaria on the sixth or seventh day of the pupa. 

 f, fat bodies ; /, /, ovarian ligaments ; o, ovary ; ov, oviduct ; po, parovaria ; 

 r s, receptacula seminis ; z>, vagina. 



This portion of the tube is beautifully transparent, and is lined 

 with large glandular epithelial cells, with distinct nuclei, 

 similar to those of the fully-developed parovarium. 



The Utero-Vaginal Tube and Oviduct is a pouch of the hypo- 

 dermis, and the oviduct exhibits two blind tubse which are con- 

 nected with the ovary by delicate bands of peritoneal tissue. 

 In some earlier stages which I have seen (Fig. 102), the tubae 

 are undeveloped and the oviduct is a mere pouch at the 

 anterior end of the bursa into which the ducts of the parovaria 

 open. 



