HELMIXTHOLOGICAL NOTES.— JOHNSTON. 



191 



The cirrus sac, a large irregularly rounded organ, lies laterally near th'.; 

 middle of the pore-bearing margin of the proglottis. It measures about -38 mm. 

 in length and -28 mm. in maximum breadth. Within it lies the long, coiled 



Fig. 11. — Portion of segment, c, cirrus ; c.j/.o., genital atrinm ; c.s., cirrus sac ; excr., 

 ventral excretory canal ; g.p., genital pore ; sp.m., sphincter muscle aromid genital atrium and 

 outer portion of vagina ; v.d., vas deferens. Other lettering as in previous figures, 



ejaculatory duct whose outer end is widened to constitute the cirrus. The 

 latter when introverted has a length of about -25 nnu. and a breadth of -07 mm. 

 Spines were not observed on it. The organ does not appear to be ver^^ muscular. 



Fig. 12. — Showing details of female system, &c./.d., fertilising duct; r.s., receptaculum 

 seminis ; s.g., shell-gland ; vit.d., vitelline duct. The short oviduct is also shown. 



The male aperture opens into the genital atrium usually behind, but 

 above the level of, the female pore. The terminal portion of the male apparatus 

 is directed anterolaterallv. 



