72 



STEONGYLID.E OR PALISADE-WORMS. 



They do not enter the blood as does S. armatum. The eggs 

 are introduced in water, and probably forage, and give rise to 

 embryos which encyst direct in the walls of the cascum and 



Flu. 24. — Vekmiceous Ankuuism of Great Mesenteric Artery (^ nat. size). 

 Raillii't. (From Nouniann.) 



fi, Aorta ; c, Cd'liiie ; /*, hepatic ; s, splenic ; m, trunk of great niesmiteric ; /(f, anterior 

 fasciculus Willi antuiisni ; oj, left colic ; cf, first artery of floating colon ; fg, arteries 

 of small intestine; td, ri>;ht fasciculus witli aneurism; cd, right colic; rg, renal; ci, 

 inferior c;ecal ; cs, superior ciecal ai-teries. 



colon, where they form tumourous patches similar to ;?. ar- 

 matum. Here lying in the cysts the white coiled worms 

 (lig. 20) produce inflammation, colics, and serious ana3mia. 

 When mature they make their e.xit, and live for some time 



