TRICHOSTRONGYLIN^ 



269 



-o.p. 



■-mt. 



Fig. 134.— 

 Hsemonohus con- 

 tortus, female. 

 *Vulva. xS. (Af- 

 ter Ransom, Bull. 

 No. 127, Bu. 

 An. Ind., U. S. 

 Dept. Agr.). 



m.l. 



Fig. 136. — Hffimonehus contortus, — enlarged, 

 Posterior extremity of male, dorsal view; d. 

 dorsal ray supporting the asymmetrically 

 situated dorsal lobe of bursa; e. d., externo- 

 dorsal ray; e. 1., externo-lateral ray; gub., 

 gubernaculum ; 1. v., latero-ventral ray; m. 1., 

 medio-lateral ray; p. 1., postero-lateral ray; 

 sp., spicule; v. v., ventro-ventral ray (after 

 Ransom, Bull. No. 127, Bureau An. Ind., tJ. S. 

 Dept. Agr.). 



Length of female, about 6 mm. (1/4 

 of an inch); male about 5 mm. (3/16 

 of an inch). 



The eggs are oval, 63-70 microns in 

 length by 30-32 microns in width, seg- 



FiG. 135. — Hsemou- 

 chus contortus, an- 

 terior portion of 

 body, — enlarged : c. 

 p., cervical papilla; 

 es., esophagus; int., 

 intestine; n. r., nerve i ^ i ,■ e ^ -x- 



ring (after Ransom, mented at tune of deposition. 



Bull. No. 127, Bu. The worm is parasitic in the small 



An. Ind., u. s. Dept. jn^estine, more rarely the abomasum, 



of the sheep and goat. 



3. Ostertagia marshalli. Fig. 139. Trichostrongylinse (p. 268). — 



The mouth is small and surrounded by six indistinct papillae. The 



cuticle has twenty-five to thirty-five longitudinal ridges appearing as 



lines. Cervical papillce 340^15 microns from anterior end of the body. 



The bursa of the male is bilobate; spicules short and similar, yellowish 



brown in color. The tail of the female is slender, gradually tapering, 



and roimded at the tip. The vulva is a transverse slit located near the 



tail extremity. 



