168 



THE COCKROACH 



2. In the female. 



a. The ovaries are two sets of elongated tubular organs 

 in the hinder part of the abdomen. Each set 

 consists of eight tubes, united in front and 

 attached by a ligament to the dorsal wall of the 

 thorax. Behind and below they unite to form 

 the oviducts. Each tube has a moniliform ap- 

 pearance, from the bulgings caused by the con- 



FiG. 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 coUeterial glands is shown. The thick 

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

 (o. H. H.) 



A, anus. O, anal cercus. CG-, colleterial glands. CO, aperture of ducts 

 of colleterial glands. G-, gonapophyses. Gr 5 and (x 6, tlie 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 spermatheca. S 4, 

 S o5, etc., fourth and following sterna. T 4, T 5, etc., fourth and following 

 terga. 



tained ova : in the hinder and lower part of the 

 tube the ova are large and nearly mature ; those 



