TRICHOSTRONG YL US 



665 



Morphology. — Male 4-5 to 5-5 millimetres in length, o-o8 milli- 

 metre in breadth just in front of the bursa. Spicule 126 to 134 

 accessory piece 75 to 80 /j, in length. 



Female 4-5 to 6 millimetres in length, anus 0-04 to 0-05 milli- 

 metre, and vulva I -08 to 1-25 millimetres in front of the tip of the 

 tail, which is short. Egg 76 to 80 by 43 to 46 /j,. 



Life-History.— This is unknown. 



Pathogenicity.— Believed to be unimportant. 



Trichostrongylus vitrinus Looss, 1905. 



T. vitrinus is found in the duodenum of sheep and dromedaries, 

 and also in man in Egypt. 



Male 4 to 5-5 millimetres in length by 0-085 millimetre in breadth 

 in front of the bursa, which is larger than in the other two species. 

 Spicule 160 to 170 fji, accessory piece 85 to 95 ^ in length. 



Female 5 to 6-5 millimetres long; vulva 1-15 to 1-25 millimetres 

 in front of the tip of the tail; egg 84 to 90 by 46 to 50 



Life-History. — This is not known. 



Pathogenicity. — Believed to be unimportant. 



Family 14: ANCYLOSTOMiDiE Looss, 191 1. 



Strongyles with armed mouth and bursa copulatrix provided 

 with ribs. 



Subfamilies. — Ancylostominae and Bunostominae. 



Subfamily Ancylostomin^ Looss, 1911, 



Ankylostomidae with more or less funnel-shaped mouth capsule, 

 its walls on the ventral side, and, especially towards the anterior 

 edge, provided on each side with two longitudinal thickenings 

 projecting outwards like ridges. In the gutter-like depressions 

 between the ridges lie the terminations of the dorsal and lateral v 

 papillary nerves. Floor of the mouth cavity with one pair of 

 inner ventral teeth, otherwise free from tooth-like structures. 

 Aperture of the dorsal oesophageal gland situated in the wall of the 

 mouth capsule. Bursa of the male closed all round. Only one- 

 third of the dorsal ray is cleft. The course of the genital tubes is 

 longitudinal. 



Type GenvLS—Ancylostoma Dubini, 1843. Other genus: Unci- 

 naria Frolich, 1789. 



Ancyl 0 stoma Dubini, 1843. 



Synonym.— Doc/^^i^^s Dujardin, 1845, pro parte. 



AncylostomincB with the head end, where the mouth is situated, 

 abruptly truncated. Mouth large, round, with its ventral margin 

 armed with two pairs of strong hook-like teeth, the points of which 

 are bent backwards, while the bases are continuous posteriorly with 

 longitudinal rib-like thickenings of the external surface of the 



