p),SO T. TJTMA AND T. KUPJMOTO. 



As might l)t' iiiieiTed from the ahove mention of o'enital openinp-s, 

 tlie arrangements of sexual organs in the present species are typically 

 bothriocephaline. To hegin with the male organs : 



These develope earlier than the female sexual organs, as in other 

 species of Cestodes. The testes, which present the usual features, are 

 present from sample No. 2 downwards, [n the sample just mentioned 

 they are not yet fully mature and are separated I'rom one another by 

 somewhat wider spaces than in sample No. 3 or 4, in either of which 

 the production of spermatozoa is actively going on. They may nttain 

 a diameter of 0.07 mm. Generally arranged in a single layer, they 

 occupy the usual position in the " Mittelschicht " (Ji, fig. 8). The area 

 of their horizontal distribution is divided into three parts by the 

 regions taken up by the double sets of main genital ducts. In cross- 

 sections passing midway between the anterior and posterior limits of 

 proglottides, we have counted 30-40 testicular vesicles in each of the 

 three parts. 



The cirrus (t'?V.) is a round or oval-sha])ed body, essentially 

 agreeing in its fine structure with the same organ of other Botlirioce- 

 pliahis species. It lies w^ith the axis of its tortuous lumen slightly 

 inclined from above downwards in an antero-posterior direction (fig. 12). 

 At its superior end, the cirrus is directly continuous with tlie muscular 

 wall of a, sjiherical cesiciila seniinaUs. Tlie latter presents an appearance 

 as though it were a posteriorly bent, knob-like, terminal portion of 

 the cirrus itself. Its cavity, as also the lumen of the cirrus, is narrow 

 and empty in sjimple No. 2, but filled up with and much distended 

 by spermatozoa in samples No. 3 and No. 4. In these the seminal 

 vesicle measures about 0.12 mm, and the approximately spherical 

 cirrus sibout 0.25 mm. in diameter. In sample No. 2 both are 

 mucii smtiliei'. the cirrus being liere decidedly oval-sha])ed as seen 

 in fig. 12. (In this figure, the lettering cir. referring to the second 



