48 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



walls 30/a thick. Six teeth, their height proportionately less than in 

 the male, the highest teeth being 60/*. Esophagus 900/* long, attain- 

 ing its greatest diameter (225/*) near its posterior end. Nerve ring 

 at anterior % of length of esophagus ; cervical papillae and excretory 

 pore not located. Vulva at about the middle of the body length; 

 vagina very short; uteri divergent. Tail acute; anus 225/* anterior 

 to tip. Eggs oval, 80/a long by 50/t wide, with a minute operculum 

 at the slightly smaller end. 



Life history. — Unknown; probably similar to that of Syngamus 

 trachea (p. 36). 



Distribution. — South America (and from captive bird in North 

 America, Philadelphia Zoological Park, Philadelphia, Pa., U. S. A.). 



65. 



Figs. 63-64. — Cyathostoma coscorobae. 63, Buccal capsules of female and male. 

 64, Bursa. After Chapin, 1925 



Suborder Ascaridata Railliet and Henry, 1915 



Suborder diagnosis. — Myosyringata (p. 4) : Polymyarian. Mouth 

 with 3 or 6 lips or without lips. When 3 lips are present, one is 

 median and dorsal, the others are submedian and are approximated 

 in the ventral line. Buccal capsule absent. Males with one or two 

 spicules. Females usually with two ovaries, occasionally more than 

 two (as in ascarids of snakes), oviparous. Development usually di- 

 rect and without intermediate host; it may be complicated by the 

 larvae journeying through the body, before maturity can be reached; 

 exceptionally (as in ascarids of seals) there is an intermediate host 

 (fish). 



Superfamily ASCAROIDEA Railliet and Henry, 1915 



Synonym. — Ascaridea Diesing, 1861, of Travassos, 1914. 

 Superfamily diagnosis. — Ascaridata (p. 48) : Characters of the 

 suborder. 

 Type-family. — Ascaridae Baird. 1853. 



