BEPEODUCTIVB SYSTEM. 



177 



b. The oviducts, formed as above, are a pair of short 



wide tubes, which unite, and open to the exterior 

 by a median vertical slit in the eighth sternum. 



c. The spermotheca consists of two unlike and unequal 



OEBoa of small size, opening by a median aperture 

 on the ninth sternum. It lies close behind the 

 last nerve-ganglia of the ventral chain. 



¥i(j. 39. — Periplaneta Americana. The hinder part of the abdomen of 

 the female dissected from the right side to show the reproductive 

 apparatus. The right ovary with its duct has been removed, and 

 only a small portion of the colleterial glands is shown. The thick 

 black lines represent the cut edges of the terga, sterna, etc. x 8 

 (o. H. H.) 



A, anus. C, anal cercus. CGr, colleterial glands, CO, aperture of ducts 

 of colleterial glands. Q-, gonapopiyses. G 5 and G 6, tte last two abdominal 

 nerve-ganglia. O, left ovary. OD, left oviduct. OD', median oviduct. 

 P, podical plate. B, rectum. S, tlie two divisions of the spermotheca. S 4, 

 S 5, etc., fourth and following sterna, T 4, T 5, etc., fourth and following 

 tei'ga. 



d. The colleterial glands are a pair of much-branched 

 tubular glands, whose ducts open separately, but 



N 



