406 T. B. ROSSETER ON DREPANIDOTAENIA TENUIROSIRIS. 



the 400th segment, as above mentioned, I am unable to give any 

 account of the structure of either the uterine canal or uterus and 

 oncospheres. 



Explanation of Plate 20. 



Drepanidotaenia tenuirostris. 



Fig. 1. Male organs, x 155. 



c.jt?., Cirrus pouch; v.s., vesicula seminalis ; a.p.g., 

 anterior prostate gland; p.p.g., posterior prostate 

 gland; a., proximal; 6., median; c, distal testes, with 

 their ducts, d. 



Fig. 2. Globulous cirrus chamber or cup, x 350 ; c, cirrus. 



Fig. 3. Cirrus cup, elongated with protruded cirrus, c, x 350. 



Fig. 4. The prostate glands detached, x 155. 



Fig. 5. Female organs, x 155. 



v., vulva; vg., vagina; v.c, vaginal canal; a.o., anterior 

 ovary ; p.o., posterior ovary, with their ducts ; s.g., 

 shell gland ; y.g., yelk gland ; f.c, fructifying canal ; 

 r.s., receptaculum seminis. 



¥ig. 6. Vagina, x 1400; ?7i.r., muscular rings. 



Fig. 7. Cheesy formation of yelk gland, x 350. 



Fig. 8. Worm, natural size. 



Journ. Quekett Microscopical Club, Ser. 2, Vol. VIII., No. 52, April 1903. 



