238 



COCKROACHES. PHYLUM ARTHROPODA 



the eighth abdominal sternum. On the ninth sternum a pair of 

 branched colleterial glands pour out by two openings a secretion 

 which forms the cases of the egg-capsules. There is an unequal 



S 8 Terqa 7 6 f\ 



Ana/cerci 



Rectum. 



Testis. 



(jonapophys ts. 



Ninth Sternum 

 Ductus ejaculatonus 



I/as deferens. 



Mushroom Shaped 

 gland. 



on gL abate gland. 



Pig 174 A semi-diagrammatic view of the hinder part of the body of a male 



P. americana dissected from the right side to show the generative organs. 



96 7 



Analcerci 



Anus 

 Rectum. 



I crga - 



CoUtterLai 

 'gland. 



Spermathecae 



Gonapophysts 



Sterna 



Ovary. 



Oviduct. 



p-jG. 175.— A semi-diagrammatic view of the hinder part of the body of a 

 female P. americana dissected from the right side to show the generative 

 organs. 



pair of spermathecae, which open between the eighth and ninth 

 abdominal sterna and store spermatozoa received from a male 

 in copulation. The eggs are produced alternately by the two 

 ovaries, and as they pass down the oviduct are enclosed in a single 

 capsule or ootheca. As more eggs are formed this protrudes from 



