64 



STEONGYLID^ OR PALISADE-WOEMS. 



mer is a pinkish- or brownish-white worm, varying from 8 mm. 

 to 16 mm. in length, the male being smaller than the female, 

 and provided with a bursa excised on the ventral surface, the 



Fig. 21. — Vermicbotts Aneurism of Great Mesenteric Artery (J natural size). 

 RaiUiet. (Fi-om Neumann.) 



a, Aorta ; c, cosliac ; li, hepatic ; s, splenic; m, trunk of great mesenteric ; ia, anterior 

 fasciculus with aneurism; eg, left colic ; cf, first artery of floating colon; fg, arteries 

 of small intestine ; td, right fasciculus with aneurism ; cd, right colic ; rg, renal ; ci, 

 inferior csecal ; cs, superior caical arteries. 



female having a pointed tail. On each side of the body, a little 

 in front of the end of the cesophagus, is a long, lateral, spine-like 

 body. S. rubrum is very similar, but is always red in colour 

 and smaller in size, and has no lateral spine. These two 



