T^NIOID CESTODES OF NORTH AMERICAN BIRDS. 



23 



regularly alternate in the anterior third of the segment. Male and 

 female genital canals pass dorsal of excretory vessels and nerve. 



Male reproductive organs. — Testicles (fig. 12, t.) about 18 (12-14 

 Fuhrmann) in number, oval, maximum size 80 to lOO^u,, located in the 



lOQu. 



Fig. 10.- 



-LlGA BRASILIEXSIS : ROSTELLUM, EX- 

 TRUDED. 



5Qu.. 

 Fig. 11. LiGA BIIASILIENSIS 



Hooks from rostellum. 



middle field of the posterior two-thirds of the segment, nine in each 

 lateral half of the segment. Vas deferens (figs. 12, 13, v. clef.) forms 

 a mass of coils in the anterior third of the segment, beginning near 

 the median line and extending outward nearly to the genital pore, 



vagr. 



y.g. 



lOQu.. 



Fig. 12. — Liga brasiliensis : Sexually mature segment, c. p., Cirrus pouch, ov.. 

 Ovary, sem. recept.. Seminal receptacle, t.. Testicles, vag., '\'agina. r. def., 

 Vas deferens, y. g., Yolk gland. 



and also describes a number of coils after entering the cirrus sac. 

 No vesicular enlargements in any part of the vas deferens. Cirrus 

 sac (figs. 12, 13, c. p.) oval, elongated, 80 to lOOfx. long by 40 to 55/x 

 "wide. Cirrus 40 to 50/x long, armed with highly refractile spines. 



