78 SOME NEW QUEENSLAND ENDOPABASITES. 



wide transverse vessel connects the ventral canals near 

 the posterior end of each segment. The main longitudinal 

 nerve is situated immediately dorso-laterally to the ventral 

 canal of the corresponding side. The sexducts pass between 

 the excretory vessels and dorsally to the nerve. 



Male genitalia :■ — There are about eight testes each 

 30-40 fj, in diameter, lying behind the ovary and uterus, 

 but above the vitellarium. Occasionally some occur in the 

 medulla between, and lateral!}^ from, the excretory canals. 



The vas deferens becomes considerably coiled on the 

 pore side of the uterus and paruterine organ. It lies above 

 and close 'to the vaghia, its course being approximately 

 parallel to it. Both of these ducts pass outwards just 

 dorsally to the nerve and v^entral vessel, the vas deferens 

 entering the small cirrus sac within whose inner portion 

 it becomes coiled. The cirrus sac is a pyriform structure, 

 25-30 ju in maximum width and 50-60 ju, in length. Its 

 musculature is weak. The organ does not extend inwardly 

 as far as the excretory canals. It contains a small cirrus. 

 The male pore lies at the bottom of a genital cloaca, its 

 position being immediately dorsal or antero-dorsal to the 

 female aperture. 



Female organs : — The small bilobed ovary lies in the 

 anterior part of the segment, in front of the testes. It 

 is not median but is situated in an oblique position nearer 

 the pore-bearing edge. The \ntellarium is placed poster- 

 iorly below the testes. 



From the female aperture which lies just below the 

 male pore, the vagina travels inwards below and beside 

 the vas deferens and immediately above the nerve and 

 ventral excretory canal. A small receptaculum seminis 

 may be recognisable. The vagina bends slightly back- 

 wards. 



The uterus appears near the centre of the segment 

 but rather towards the aporal side, just in front of, and 

 ventrally to the testes, but behind the ovary. It is a 

 simple spherical sac. As it develops the testes and ovary 

 •soon disappear. A mass of altered parenchyma makes 

 its appearance antero- ventrally from the uterus, this paru- 



