Plate XVI. 



Figs. 1 — 3. Trachta delibrata, Benson, p. 225. 



1, genital organs ; 2, jaw ; 3, various teeth of one transverse series. 



Figs. 4 — 10. Sesara infrendens, Gould, p. 242 et seq. 



4, genital organs of a young specimen ; 5, the same of a full 

 grown specimen ; 6, horny organ situated in an appendage of the 

 oviduct, enlarged ten times the natural size ; 7, a transparent, 

 horny, bearded thread, connected with the appendage represented 

 in fig. 6 ; 8, similar threads, as seen in fig. 7, but not bearded ; 

 9, jaw ; 10, different teeth of one transverse row. 



ho, hermaphrodite opening ; p, penis ; m, retractor muscle j ut, uterus ; 

 rs, seminal receptacle ; lid, hermaph. duct ; alg, albuminous gland ; vd, seminal 

 duct ; c, calciferous sac ; /, flagellum j x upper and x f , lower end of tho peculiar 

 horny appendage of the oviduct j n, place where the end of the horny appendage 

 was originally situated. 



