NEMATODE PARASITES OF BIRDS 



31 



with characters of the tribe and the following specific characters: 

 Dorsal lobe very long and attached perpendicular to body ; the com- 

 mon ventral stem unites with the common lateral stem to form a 

 large stem mass; the externo-dorsal ray originates at the base of 

 the dorsal ray near its union with this stem mass; the postero-lat- 

 eral ray comes off first from the lateral stem and diverges farther 

 from the medio-lateral than does the externo-lateral ; the medio-lat- 

 eral is the longest of the 3 rays. The main branches of the dorsal 

 ray give off external branches which again divide to form 2 small 

 branches. Genital cone large. Spicules equal. Gubernaculum or 

 telamon present. Vulva and anus close together. Ovejectors con- 

 vergent. 



Type species. — C odiostomum struthionis (Horst, 1885) Railliet and 

 Henry, 1911. 



Figs. 28-30. — Codiostomum steuthionis. 28, Head end. 29, Buccal cadsule. 

 30, Male bursa., spread out. After Horst, 1885 



CODIOSTOMUM STRUTHIONIS (Horst, 1885) Railliet and Henry, 1911 



Synonym. — Sclerostomy, struthionis Horst, 1885. 



Hosts. — Struthio molybdophanes, S. camelus, S. aus traits. 



Location. — Ceca, large intestine, and stomach. 



Specific diagnosis. — Codiostomum (p. 30) : White or yellow, rather 

 stiff worms. Buccal capsule (fig. 29) 28G> deep by 100> wide at 

 oral aperture, and with well developed dorsal gutter. Submedian 

 and lateral papillae present, Head (figs. 28 and 29) with inner and 

 outer leaf crown of many elements, more in outer than inner, judging 

 from Monnig's figure, the outer long and slender, the inner shorter. 



Male 13 to 17 mm. long by 420 to 450^, wide. Esophagus length 

 1/12 of body length. Bursa (figs. 30 and 31) characters those of the 

 genus. Prebursal papillae present. Spicules equal, about 870/x 

 to 1 mm. long, alate, transversely striated, curved, and widened in 

 the proximal third of their length. Gubernaculuiu boat-shaped, 



