STRONG-YLUS ARMATUS. 
361 
orses were so affected. They are found principally in the 
irge mesenteric artery and its branches, although it is found 
1 other arteries. 
Description of Parasite. 
Armed Sclerostome .—Body gray or brown, shaded with 
2d ; straight, rigid, the anterior part being broader than that 
r hich immediately follows (see Plate 1). Mouth orbicular, 
ddely open, and rendered tense by several chitinous, con- 
sntric rings, the innermost of which are garnished with fine 
jeth, while the outermost carry six papillas "symmetrically 
ivided. On the outermost ring there is, also, a fringe of 
hat appeared like long, slender, sharp-pointed cilia ; these 
re not seen when the mouth is closed ; they are best shown 
y pressing on the cover glass, and so pressing the air out of 
le mouth, causing the cilia to spread outward. The six pa- 
illae mentioned by Neumann are sharp spicules, and are 
irved inward, hook-like, and probably serve the purpose of 
taching the worm to the mucous membrane. The buccal 
ipsule is sustained by a dorsal longitudinal line or rib, and 
.is at the bottom two round, sharp plates. Opening out of 
le mouth is the pharyngeal capsule, which is armed ante- 
orly, and is funnel shaped, the posterior opening being the 
nailer. The anterior portion of the oesophagus is constrict- 
1 and narrow for about a third of its length, when it begins 
• expand, forming the posterior ventricle or bulb. 
1 The caudal pouch of the male is almost trilobate, the pos- 
rior ribs being trifurcated, the middle double, and the an- 
rior cleft. From the anterior portion of the pouch, the 
>icula or male genital organ projects. It is first divided 
to two equal parts—deferens canals—which afterward unite 
•ward the extremity. 
The female, which is much thicker and larger than the 
ale, has the tail obtuse, and the vulva situated in the poste- 
or moiety of the body; and is surrounded by a roughened 
rcular surface of a reddish brown color, which is grasped 
7 the caudal pouch of the male during copulation. The 
erus occupies a large part of the body ; it can be made out 
