432 C. GORDON HEWITT. 



segment consists of two parallel and slender sclerites (viii, d.), 

 not so narrow as those of the two preceding segments. A 

 pair of slender sclerites (viii, v.} also represents the ventral 

 arch. The terminal anal segment, which I consider repre- 

 sents the reduced ninth segment, has a dorsal chitinous 

 sclerite, the sub-anal plate (su.p.), which is triangular in 

 shape, and a ventral sub-aual plate of the same shape. The 

 female genital aperture is situated at the anterior end of the 

 latter plate, between the eighth and anal (ninth) segments. 

 A pair of terminal setose tubercles is situated laterally at the 

 apex of the anal segment. 



The Male Reproductive Organs. The male repro- 

 ductive organs (fig. 24) are situated ventral to the alimentary 

 canal, and lie within the fifth abdominal segment. They 

 consist of a pair of testes, vasa deferentia, ejaculatory duct 

 and sac, and the terminal penis. There are no accessory 

 genital glands in the male. 



The testes (te.) are a pair of brown pyriform bodies, with 

 their long axes placed transversely, and their pointed ends 

 facing. In young males they have a bright red appearance. 

 They are covered with a follicular investment of cells, which 

 varies in thickness apparently according to age. The thin 

 brown chitinous capsules contain the developing spermato- 

 zoa. The pointed end of each testis is continued as a fine 

 vas deferens (v.d.), which meets that of the other testis in the 

 median line, where they open into the common ejaculatory 

 duct (d.e.). This runs forwards for a short distance, and then 

 bends to the left ventrally, and, after several convolutions on 

 the left ventral side of the abdomen, the duct narrows con- 

 siderably, forming a narrow ejaculatory duct. This crosses 

 over the dorsal side of the rectum to the right 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 muscles, giving the walls a striated appearance. 

 It contains a phylliform, chitinous sclerite the ejaculatory 

 apodeme (e.a.) } which has a short handle at the broad end. 



