246 Vetermary Medicine. 



zone ; stomach larger than in ascaris. Live in intestines 

 of birds. Very common. 



Genus: Oxyuris, (oxys sharp, pointed, oura tail). Body 

 cylindroid or fusiform, tail in sharp point ; mouth round 

 when closed, triangular and trilobate when open ; oesopha- 

 gus cylindroid ; .stomach large with hard corneous lining 

 like a gizzard ; anus in front of tail, vulva in anterior 

 fourth or third of body. Male with two spicula, the 

 posterior very small, in a membranous pouch. 



Genus: Strongylus. (Stroggylos cylindrical). Body cylind- 

 roid, thickness to length as 1:35 or 1:130. usually narrower 

 toward the head ; mouth triangular or round, with or 

 without papillae ; skin transversely striated ; oesophagus 

 club-shaped, enlarged behind. Two spicula of equal 

 length ; vulva near the middle of the body. Anus not 

 terminal. 



Genus: Sclerostoma (scleros hard, armed, stoma mouth). This 

 is the type of all worms with chitinous or horny armature 

 or teeth by which they penetrate the tissues and suck blood. 

 Body white or brown, cylindroid, male narrowed toward 

 the head, female toward both ends. Mouth round, open, 

 furnished with hard, chitinous ring or rings, or sharp 

 pointed teeth ; male with two nearly terminal spicula and 

 large membranous pouch. Anus in front of caudal point. 

 Vulva two-thirds of the length from the head, ova globular 

 or nearly so. Mature in large intestines of mammals. 



Genus: Uncinaria, (uncinus hook). So named because its 

 head is sharply curved dorsad. The mouth, round, opens 

 dorsad with horny lining, two to four sharp, curved teeth 

 projecting from its ventral wall internally, and opposing 

 plates above often dentated. 



Genus : OUulanus. Mouth urn-shaped with chitinous lining, 

 a muscular oesophagus, and in the male two short spicula 

 in a bilobed membranous pouch. Mature in cat's stomach ; 

 immature in muscles, etc. 



Genus : CEsophagostoma. Marked by the absence of any 

 mouth capsule, the orifice being directly continuous into 

 the oesophagus. Mouth has papillse dorsal, ventral and 

 lateral, a chitinous, dentated ring. Male with two spicula 



