Plate II. 



\v p 



Vol. IV. 



© ® 



-^ ~k- -\- ^ vX( 



1, Reproductive organs of i%/zx /z(?r/f«j'w nat. size ; d, dart-sac; in, mucous 

 glands ; s, spermatheca with its duct and branch ; o, oviduct ; /, male organ ; 

 r, retractor muscle ; v, vas deferens ; f, flagellum. 2, Vaginal tube laid open 

 showing outlet of dart-sac. 3, Four types of dart-sac. 4, Section of dart-sac. 

 5, Annulus in situ on the tubercle. 6, Base of dart attached to annulus. 

 7, Section of base of dart. 8, .Section of point. 9, Diagrammatic sections of 

 darts arranged from simple to complex. 



