64 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 55. 



cirrus pouch is a very narrow, elongated, nozzle-shaped structure, 

 the distance from the median end of the cirrus pouch to the tip of 

 the very narrowlj'' elongate conical genital eminence being 200 to 

 300 [). and the maximum width, near the median end, 55 to 99 [J^; 

 the pouch is occasionally bent or curved; it is expanded to contain 

 the few loops of the cirrus only in the median portion. The external 



^ ^ aperture is often on 



inirn. \ the side, rather than 



the tip, of the gen- 

 ital cone. 



F em ale genita- 

 lia. — The ovaries are 

 often of approxi- 

 mately equal size and 

 elongated along the 

 transverse axis ol 

 the strobila. The 

 vitellarium is like- 

 wise elongated in 

 the same direction; 

 it does not extend 

 laterally as far as 

 the ovaries; in toto 

 mounts it sometimes 

 seems to connect the 

 posterior portions of 

 the ovaries. The 

 shell gland is small 

 and inconspicuous. 

 The vagina comes in 

 from the lateral 

 margin of the seg- 

 ment, presents a re- 

 flexed loop, or sev- 

 eral loops, near the 

 longitudinal ex- 

 cretory canal and 

 curves sharply around the nearest ovary to the interovarian field. In 

 gravid segments (fig. 55) the median stem of the uterus has 20 to 25 

 lateral branches, or so many branches which in turn send out numerous 

 anastomosing branches that a count is impossible. The entire me- 

 dian field is filled with uterine developments to the point where 

 almost no remaining parenchyma can be detected between the 

 growths. Even in gravid segments the posterior flap of the segments 

 overlaps the anterior portion of the succeeding segment so much as to 



Fig. 55.— Multiceps skri.m.is. Gravid segment. 



