Nematoids. Round Worms. 247 



in ample membraneous pouch. Vulva in front of anus 

 and near the pointed tail. Ova elliptical. Mature in the 

 intestines of mammals. 



Genus: Stephanurus, (stephanos crown, oura tail). Body 

 cylindroid, narrowed toward head ; mouth round with two 

 large and four smaller teeth ; male with single spiculum, 

 in large five lobed membraneous pouch. Female with in- 

 flected, pointed tail, having a tubercle on each side. 

 Known only as encysted in connective tis!5ue of pig. 



Genus: Physaloptera, (physallis bladder, pteron wing). 

 Mouth with two prominent lips, each bearing three papillae 

 externally and teeth internally. The caudal pouch of the 

 male is closed or bladder-like, and covers the base of the 

 tail. Oviparous. Found in intestine in birds. 



Genus: Globocephalus, (globos round, cephale head). Head 

 spherical, transparent. Mouth round with smooth mar- 

 ginal ring. Buccal cavity has two horny rings, anterior 

 and posterior, with four horny connecting beams. Found 

 in intestines of pig. 



Genus: Syngamus, (syn with, gamos marriage). Copulation 

 permanent, the caudal end of the male being always at- 

 tached to the vulva of the female, so that they appear as a 

 forked worm. Mouth large and held open by the hard 

 chitinous capsule of the buccal cavity. Male one-third 

 the length of the female, has two spiculae. Vulva in an- 

 terior third. In air passages of birds. 



Genus: Gnathostoma, (gnathos jaw, stoma mouth). Cheir- 

 acanthus (cheir hand, acantha thorn). Cylindroid worm 

 with front of body covered with scabs having recurved 

 spines. Body tapers to a caudal point. Named from the 

 jaw-like armed mouth by which it fastens itself to the 

 gastric mucosa. In pig, dog and cat. 



Genus : Trichina, (trix hair). Minute worms, \ inch long, 

 tapering in anterior half, anus terminal, single spiculum. 

 Mature in bowels. Ovoviviparous : embryos migrate into 

 muscles, where they are encysted and sexually immature. 

 Found in man, pig, rat and other mammals. 



Genus: Rhabdonema (rabdos rod, wand). Very .small thread 

 worms, the females of which only are found in the bowels. 



