436 



THE ANIMAL PARASITES OF MAN 



antero-anterior and postero-median equally thick, straight. Spicule 

 o'i6 to 0*17 mm. long, gubernaculum 0*085 to 0*095 mm - lon g- 

 Female 5 to 6-5 mm. long, vulval opening 1-15 to 1-25 mm. distant 

 from tip of tail, crescent shaped, oblique to body axis, and around 

 it irregular thickenings. Ova 84 /* to 90 /* by 46 //, to 50 //,. 



In duodenum of Ovis 

 aries, 0. laticauda, occa- 

 \~qub. sionally in Camelus drome- 

 darius and in man (Egypt). 



e'.l. 



rn.l. 



FlG. 314. Trichosirongylus 

 vitrinus : spicules and guber- 

 naculum ; on left, ventral 

 view ; on right, lateral view. 

 X c. 300. (After Looss.) 



FIG. 313. Trichostrongylus vitrinus : tail of male 

 from left side, d., posterior; e.d., postero-external ; 

 /./., postero-median ; /./., antero-median ; ./., antero- 

 external ; Lv., latero-anterior ; z>.z>., antero-anterior; 

 gub. t portion of gubernaculum ; */., portion of spicule. 

 x c. 300. (After Looss.) 



Genus. Haemonchus, Cobb., 1898. 



Small mouth cavity contains a " tooth " or " lancet " arising from 

 the dorsal side. Cuticle of head and neck not inflated. Cervical 

 papillae well marked. Bursa bilateral, with large lateral lobes and a 

 small dorsal lobe not median, but lateral, attached to the base of one 

 of the lateral lobes (fig. 316). Posterior ray bifurcate, each branch 

 bifid apically. Each lateral lobe six rays. Anterior rays separated 

 distally, curving forward. Antero-median and postero-median rays 

 distally curve away from the antero-external. Postero-external ray 

 long and slender. Spicules less than i mm. Gubernaculum present. 

 Vulva in posterior part of body covered by a prominent tongue-like 

 flap. Eggs ellipsoidal. 



Haemonchus contortus, Rudolphi, 1803 ; Cobb., 1898. 



Dorsal " tooth" or "lancet" io//- to 15/1, long. Cervical papillae 

 0-3 mm. from head. 



Male 20 mm. long by 400 ^ thick (maximum). Asymmetrical lobe 



