3<S2 



I. IJIMA AND T. KURIMOTO. 



either side into an elongated bundle of anastomosing branches (oc, fig. 

 10). At its middle, whence the oviduct arises, it measures only 

 0.01 mm. or less in thickness while the lateral, divided portion may 

 be nearly 0.08 mm. broad. In functional activity, it may measure 

 1 nnu. from the origin of the oviduct to either of its extremities. Its 

 position in the proglottis is on the ventral side of the il/'i/,^c/.S6'//R'/?^, 

 along the posterior proglottidal border. 



The exact course of the female ducts could only be conveniently 

 studied by combining sections (^f sample JSTo. 2, where they were yet 

 without contents except some masses of yolk-like granules that occurred 

 here and there in the uterus. The oviduct (ovd., fig. 10), after its 

 origin from the ovary, at first runs backwards, soon to take an 

 irreo-ular ascendins; course, which is at the same time directed out- 

 wards, i. e., away from the median line of the tape-worm. During this 

 course, the oviduct is j(3ined first l^y the vagina that approaches it 

 from the median side and then, after a short interval, by the yolk- 

 duct that comes u[) from below. In tracing the lumen of the oviduct 

 from tlie ovary, it appears to be directly continuous into that of the 

 vagina (as shown l)y the unshaded passage in fig. 10), rather than 

 into the remaining portion of the oviduct leading towards the junc- 

 tion of the yolk-duct. 



The vagina (I'dfJ.) i« a fine duct, that makes a few windings 

 beneath the uterus but crosses the ovary on its dorsal side. Ptjsteriorly 

 and close to the junction with the oviduct, the vaginal tube swells uj) 

 into an oblong vesicle, which we consider to be the receptaculuui seminis 

 (d)., fig. 10). Anteriorly it descends almost perpendicularly along the 

 posterior border of the cirrus and opens at the vaginal pore (auj. o., 

 fig. 12) just behind the cirrus opening. 



The yolk-duct (dtg., fig. 10) is a very thin tube that after descend- 

 ing: ÎI short distance from the oviduct soon becomes untraceable. 



