74 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



the head end in Seurat's specimen. Vestibule 5.5 mm. long; un- 

 paired trompe 1.8 mm. long. Eggs 60 to 63/* long by 40 to 42/* wide. 



Life history. — Probably similar to that of II. gallinae (p. 54). 



Distribution. — Asia (Turkestan) and Africa (Algeria (Medea)). 



HETERAKIS VALVATA Schneider, 18G6 



Hosts. — Grypturus cupreus and C. nocticagus. 



Location. — Ceca. 



Morphology. — Ileterakis (p. 50) : Mouth with 3 small equal lips. 

 Lateral membranes present. Esophagus with bulb about 217/* in 

 diameter; slender part about 1.45 mm. long. 



Male 10 mm. long. Caudal alac small. Preanal 

 sucker 90/* in diameter, with papilliform nodule on 

 its posterior edge. The anterior lip of the cloacal 

 aperture, which is 170//, from the posterior extremity, 

 projects as a triangular valve, from which the 

 species derives its name. Schneider described and 

 figured (fig. 103) only 11 pairs of papillae, but 

 according to Travassos (fig. 102) there are 13 pairs. 

 Spicules unequal, 2.6 mm. and 1 mm. long. 



Figs. 102-103. — Heterakis valvata. 102, Male tail. After Travassos, 1913. 103, 

 Male tail. After Schneider, 1860 



Female 12 to 15 mm. long. Vulva slightly posterior to middle of 

 body, with 2 papilliform projections just below it. Anus 780/* from 

 posterior end. Eggs 74/* long by 37/* wide. 



Life history. — Probably similar to that of II. gallinae (p. 54). 



Distribution, — South America (Brazil). 



(?) HETERAKIS VALDEMUCRONATA (Molin, 1860) Stossieh, 1887 



Synonym. — Ascaris valdemueronata Molin, 1860. 



Hosts. — Ciconia maguari and Euxenura maguari. 



Location. — Proventriculus. 



Morphology. — ? Heterakis (p. 50) : Head with alae: mouth with 3 

 lips. Body attenuated anteriorly. 



Male 7 mm. long. Posterior extremity bent, acutely conical, with 

 long mucron. Anterior to the cloacal aperture a depression with 

 saucer-shaped muscular sucker. 



Female 12 mm. long by 200/* wide. Posterior extremity obtuse, 

 with mucron. 



