SYNGAMINAE 165 



Subfam. 4. STEPHANURINAE Railliet, Henry & Bauche, 



1919. 



Buccal capsule well developed, cup-shaped, with a leaf-crown 

 at its anterior margin. Bursa of male subterminal and poorly 

 developed, with stunted rays. Parasitic in the perirenal tissue 

 or kidneys, less commonly in the liver and lungs, of Mammals. 



1. Stephanurus Diesing, 1839. 



A relatively stout form. Mouth circular, provided with an 

 external leaf-crown of small elements. Cuticle surrounding 

 the mouth reflected externally into six thickenings or 

 " epaulettes," two median and four submedian. Buccal 

 capsule cup-shaped, with thick walls. At its base there are 

 six teeth which may be bicuspid or tricuspid. Rays of bursa 

 short and stout. Dorsal ray divides into two branches which 

 are bifurcate or trifurcate at their tips. Lateral rays closely 

 applied to each other, the postero-lateral thicker than the 

 other two. Spicules equal or subequal. An accessory piece 

 present. Tail of female short, abruptly attenuated behind 

 the anus, and bearing a pair of lateral globular cuticular 

 processes. Vulva close to anus. Uterine branches parallel. 

 The intestine is considerably longer than the body, and is 

 therefore convoluted. 



Hab. Perirenal fat, liver, abdominal viscera and, more 

 rarely, lungs of Pigs ; liver of cattle (one species known). 

 Genotype : S. dentatus Diesing, 1839. 



Diesing, 1839, Ann. Wien. Mus. Naturg., ii, 232; Taylor, 

 1899, 16th Ann. Rep. Bur. Anim. Indust., Washington, 612; 

 Daubney, 1922, Journ. Comp. Path. Ther., xxxvi, 97. 



Subfam. 5. SYNGAMINAE nov. 



Buccal capsule well developed, subglobular, without leaf- 

 crowns at its anterior margin, but with teeth at its base. Eggs 

 operculate. Parasites of the respiratory tract of Birds and 

 Mammals. 



1. Syngamus v. Siebold, 1836. 



Sexes joined permanently i7i copula. Buccal capsule large, 

 furnished at its base with eight or nine teeth. Bursa of male 

 thick-walled, fleshy, its rays short and stout. Spicules small, 

 in some species extremely small and difficult to detect. Vulva 

 in anterior third of body. 



Hab. Respiratory tract of Birds and Mammals. 

 Genotjqje : *S^. [Fasciola] trachea (Montagu, 1811) (= S. 

 trachealis v. Siebold, 1836). 



