MALE REPRODUCTIVE ORGANS 



53 



crosses over the dorsal side of the rectum to the rigbt side, where 

 it runs forwards for a short distance and then curves back in the 

 median ventral line, opening into a pyriform ejaculatory sac (e.s.). 

 The walls of this ejaculatory sac are muscular, longitudinal nmsclea, 

 giving the walls a striated appearance. It contains a pliyllit'oi'm^ 



de-Cy 



_^_ -pqqI^^ 



'i\m:^ 



Fig. 23. The male reproductive organs. They have been slightly spread out, and 

 the rectum {rect.) has been turned over to the right side. 



d.e. Ejaculatory duct. e.a. Ejaculatory apodeme. e.s. Ejaculatory sac. 



te. Testis. v.d. Vas deferens. 



chitinous sclerite — the ejaculatory apodeme (e.a.) which has a short 

 handle at the broad end. This sclerite is no doubt of gTeat assist- 

 ance in propelling the seminal fluid along the ejaculatory duct 

 during copulation. A short distance behind the ejaculatory sac 

 the duct opens into the penis. 



The male gonapophyses. 



The extremity of the abdomen in the male (fig. 24) has under- 

 gone considerable modification in the formation of the external 

 genitalia. The visible portion of the abdomen, as seen from above, 

 consists of the first five abdominal segments ; the remaining three 

 segments are slightly withdrawn into the fifth segment, and on 

 looking at the abdomen from the posterior end, only the terminal 



