Sonic J^ariafioiis in Hynicnolepis diniinnta ii 



forms a large dilatation, the seminal vesicle, from which it con- 

 tinues as a canal to the cirrus pouch, which it enters and trav- 

 erses, becoming muscular and finally forming the slender cirrus 

 shown partly in longitudinal section in figure lo. The cirrus 

 pouch is a muscular sac-like structure with circular and longi- 

 tudinal fibers best developed, although oblique fibers may be fre- 

 quently observ^ed. 



The cirrus pouch opens externally at the genital pore. The 

 position of the genital pore is on the left border of the proglottid, 

 as it is usually stated, at the junction of the anterior and middle 

 thirds. From an extensive series of measurements I have con- 

 cluded that the position of this pore is not so constant and may 

 vary somewhat i'n different specimens and even in different pro- 

 glottides of the same strobila. In making these measurements I 

 have taken the distance from. the genital pore to the posterior bor- 

 der of the proglottid as Compared with the distance from the pore 

 to the posterior border of the proglottid preceding. The former 

 distance in one proglottid at 2C cm. from the scolex in my long 

 specimen was 93 /a, the latter distance was 133 fx. In the next 

 proglottid following, as also in the third, these distances were 107 

 and 147 fji respectively ; in the fourth and fifth proglottides they 

 were 107 and 133 ix\ in the sixth 93 and 133 /a; in the seventh 80 

 and 133 ix\ in the eighth 93 and 120 /x,; in the ninth 93 and 107 /x ; 

 in the tenth 93 and 120 fx. The genital pore is hence a little more 

 than half way down on the left border of the proglottid. This is 

 partly due to the slight degree of contraction in the longitudinal 

 direction. Among the female organs variations are less promi- 

 nent. The female apparatus consists of vagina, seminal recep- 

 tacle, the seminal canal, the ovary, oviduct, shell gland, yolk gland 

 or vitellarium, yolk duct, and lastly the uterus, which has no ex- 

 ternal opening. 



The vagina is a rather straight, narrow, muscular tube run- 

 ning inward' from the genital pore and ventrally to the cirrus 

 pouch. At a third to one-half the distance inward it gradually 

 enlarges to form the dilatation which continues almost to the me- 

 dian line and is known as the seminal receptacle, a clavate muscu- 

 lar sac which contains the sperm from the male system. The 



'45 



