22 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



AMIDOSTOMUM HENRYI Skrjabin, 1915 



Host. — Vanellus cristatus. 



Location. — Gizzard. 



Morphology. — Amidostomum (p. 19) : Buccal capsule (fig. 17) 

 very small, 15 to 18.5/* wide, with 1 large tooth and 2 very small, 

 scarcely perceptible, teeth. 



Male 8 mm. long by 130 to 150/* wide. Buccal capsule 15/* 

 wide. Dorsal ray (fig. 18) has an origin separate from all other rays, 

 including the externo-dorsal ray, all these having origin in a large 

 common stem; the dorsal ray is the only one supporting the small 

 but distinct dorsal lobe. The externo-dorsal ray and postero-lateral 

 ray are short; all other rays in the lateral lobes extend to the bursal 

 margin. Spicules 166/* long, irregular in shape and each cleft dis- 



Figs. 17-19. — 17, Amidostomum henryi. Anterior end. 18, Same. Male 

 bursa. 19, Same. Tail of female. All after Skrjabin, 1916 



tally along almost half its length, judging from Skrjabin's figure. 

 Telamon (gorgeret) slender, 90/* long. 



Female 14.5 mm. long by 180 to 187/* wide. Tail (fig. 19) elon- 

 gate conical, and, in Skrjabin's figure, slightly curved. Esophagus 

 850/* long. Buccal capsule 18.5/* wide. Vulva 2.72 mm. from 

 tail end. Eggs oval, 92.5 to 103.6/* by 70 to 80/*, arranged as a 

 rule perpendicular to the long axis of the body. 



Life history. — Unknown; probably simple and direct. 



Distribution. — Asia (Russian Turkestan). 



AMIDOSTOMUM CHEVREUXI Seurat, 1918d 



Synonym. — Amidostomum skrjahini Boulenger, 1926 (see Ad- 

 denda, p. 383). 



Host. — Himantopus himantopus and (A. skrjahini) Anser albi- 

 frons. 



Location. — Gizzard, under corneus lining. 



