166 STRONGYLOIDEA 



Montagu, 1811, ilfem. Werner. Nat. Hist. Soc, Edinburgh, 

 i, 176; V. Siebold, 1836, Arch. f. Naturg., ii, 105; Chapin, 

 1925, Journ. Agric. Res., Washington, xxx, 558. 



2. Cyathostoma E. Blanchard, 1849. 



Sexes not permanently joined in copula. Buccal capsule 

 large, cup-shaped, with six or seven teeth at its base. Externo- 

 dorsal rays of bursa leave median dorsal stem high up, almost 

 at its root. Dorsal ray cleft for about one-third of its total 

 length. Spicules long and filiform. An accessory piece may 

 be present. Vulva in the middle or anterior third of the body. 



Hab. Respiratory tract of Birds. 

 Genotype : C. lari E. Blanchard, 1849. 



E. Blanchard, 1849, Ann. Sci. nat., Paris, Zool., iii, 182 ; 

 Chapin, 1925, Journ. Agric. Res., Washington, xxx, 565. 



Fam. 2. ANCYLOSTOMIDAE (Looss, 1905) Lane, 1917. 



Buccal capsule relatively well developed,* infundibular, 

 bearing ventral teeth or cutting-plates on its anterior margin. 

 Accessory branches of dorsal ray much reduced. 



Subfam. 1. ANCYLOSTOMINAE (Looss, 1905) Stephens, 



1916. 



Anterior margin of buccal capsule armed ventrally with 

 from one to four pairs of teeth. 



1. Ancylostomat (Dubini, 1843) Crephn, 1845. 



Syn. Dlploodon Molin, 1861. 



Anterior end bent dorsaUy. Mouth-opening guarded by 

 one to three pairs of ventral teeth. Buccal capsule deep, 

 infundibular, provided internally with two triangular dorsal 

 teeth. Dorsal gutter traverses the dorsal wall of the capsule 

 and opens in a deep notch on its anterior margin. Bursa 

 with a small dorsal lobe. Externo-dorsal rays arise high up 

 from median stem of dorsal ray. The latter is cleft for about 

 one-third of its length. The terminations of the main branches 

 appear tridigitate, i.e. there are two very short accessory 

 branches close to the tip of each. Spicules not barbed. An 

 accessory piece present. Vulva behind the middle of the 

 body. Uterine branches opposed. 



* The structure of the buccal capsule in Agriostomwn suggests that 

 not improbably the buccal capsule in the Ancylostomidae represents 

 in reality a bviccal capsule and oesophageal funnel combined. 



t The spelling Ancylostoma has been adopted by the International 

 Commission on Zoological Nomenclature. The name was spelt 

 Agchylostoma by Dubini, and there are numerous other variants, which 

 we have not considered it necessary to give in the synonymy. 



