68 



STRONGYLID^ OR PALISADE-WORMS. 



Groups of Nematodes. — The groups or families of Xematodes 

 of importance to the agriculturist are — 

 (i) The Bfrimgyliihi' or Palisade-worms, 

 (ii) The Trichotrarhelidtp or Whip-worms, 

 (iii) The A'^rariJn' or Eound-worms. 

 (iv) Filari(]ii' or Thread-worms ; and 

 (v) The Anguillulidm or Eelworms. 



The first four groups live as parasites upon animals, the last 

 group lives upon plants. 



STRONGYLIDiE OR PaLISADE-WOHMS. 



These worms produce many complaints in animals. They 

 are elongated and spindle-shaped, the 

 anus being placed near the tip of the 

 body, and, as in all Xematodes, the 

 anus and male opening are one and 

 the same. In these Palisade -worms 

 this male opening is surrounded by a 

 curious oup - shaped bursa, which is 

 kept expanded like an umbrella by 

 stiff ribs (fig. 22, e). The female has 

 a pointed posterior (fig. 22, d). 



-The Luno Worm 



iiuilusjih'ria), 



B, female ; c, ovum 

 ". extremity of 9 ; k 

 ' male. a. anus ; c, in 

 b, uterus. 



and enter the 



Limi/ Worms of the Shet./i. 



One of the most important and de- 

 structive Palisade-worms is the Lung- 

 worm of the lamb (Sfronfn/Ius Jtlarin), 

 a white worm which causes the disease 

 known as " husk " or " hoose." The 

 male worm is about an inch and a half 

 to two inches in length, the female 

 quite three inches. The embryos of 

 these worms are found in damp earth, 

 nubs during May, June, and July. Strongylosis 



