DREPANIDOTAENIA TENUIROSTRIS. 403 



Male Genital Organs. 



The male genital sinus is anterior to that of the female. There 

 are three testicular sacs, situated proximally, medially, and distally, 

 and they lie in the dorsal portion of the segment (Fig. 1, a.b.c.) 

 The median is the largest of the three, being 0*101 by 0'083 mm., 

 and is 0*020 mm. larger than the other two. In contour it 

 is somewhat pyriform, whilst the other two are subglobular. 

 They do not all three lie in the same plane, the proximal testis 

 being more dorsally situated than the other two. They are quite 

 distinct from each other — that is to say, the proximal and median 

 testis each send off a distinct undulating vas efferens, which 

 effects a junction with the vas deferens ; whilst the ductus 

 efferens of the distal testis goes to form the vas deferens 

 (Fig. 1, d). The vas deferens swells out and forms a long vesicula 

 seminalis, the proximal portion of which resolves itself into a 

 chorus pouch. 



The vesicula seminalis (Fig. 1, v.s.) occupies in a sexually 

 mature segment one half of the whole width of the proglottis ; its 

 widest diameter is 0*04:4: mm. Both its proximal and distal ends 

 are drawn out into a narrow neck. The neck at the proximal end 

 forms the cirrus pouch (Fig. 1, c.p.), and this again swells out 

 into a large contractile globe, to which I have given the name of 

 the globulous cirrus chamber or cup (Fig. 2), the interior of which is 

 covered with minute spines. When the cirrus is everted for the 

 purpose of coition, the cup also elongates itself until it becomes a 

 long ampulla-shaped organ. It elongates itself to the extent of 

 003 mm., whilst its orifice is 0*01 to 0*02 mm. (Fig. 3). The cirrus 

 is a short smooth hollow rod 0*034 mm. long, with a diameter of 

 0*003 to 0*007 mm., varying in different segments. The neck at 

 the distal end of the vesicula seminalis receives the afferent 

 ducts of the prostate glands. 



The prostate glands in this instance are duplex, and they are 

 situated anteriorly and posteriorly on either side of the large 

 vesicula seminalis (Fig. 1, a.j^.g., ji-j^.y., and Fig. 4). As will 

 be seen on reference to Fig. 1, they are two elongated glands 

 whose efferent ducts make a junction independently of each other 



