STRONGYLINiE 



287 



Nodular Strongylosis of the Hog. (Esophagostomlasis 



(Esophagostomum subulatum ((E. dentatum). Strongylinse (p. 

 280). — The body is straight and attenuated at both extremities. The 

 circular mouth is surrounded by a horny ring furnished with a crown of 

 converging bristles. Upon a cutaneous ridge surrounding the crown of 

 bristles are six papillae. There are no lateral membranes. The bursa of 

 the male has two lateral lobes united by a small median lobe; spicules 

 slender. The vulva of the female is just in front of the anus and is sur- 

 rounded by a prominent ring. 



The female is 12-15 mm. (1/2-9/16 of an inch) in length; male, 8-12 

 mm. (5/16-1/2 an inch). 



The eggs are oval, 60-80 microns in length by 35-45 microns in 

 breadth. 



This species is found in submucous nodules and in the lumen of the 

 large intestine of the hog. Considerable numbers may be present with- 

 out causing serious disturb- 

 ance. If the infestation is 

 unusually heavy — especially 

 if associated with the thorn- 

 headed worm — there may be 

 diarrhea, loss of appetite, 

 and general unthrift. Such 

 cases may be given treatment 

 as recommended for other 

 roundworms of the intestines 

 of the hog. 



Strongylosis of the Large 

 Intestine of the Sheep 

 AND Goat 



Chabertia ovina (Sclero- 

 stomum hypostomum). Fig. 

 154. Strongylinae (p. 280).— 

 The body is almost uniform 

 in thickness. The head is 

 shghtly globular and is ob- 

 liquely truncated anteriorly, 

 the mouth facing antero-ventrally. The buccal capsule is large; border 

 of mouth armed with a double crown of small triangular denticles. Lo- 

 cated ventrally, just in front of the excretory pore, is a short transverse 

 cervical groove. The bursa of the male is short and has an obliquely 

 cut-off appearance; spicules long and slender. The vulva of the female 



Fig. 154. — Chabertia ovina; male at right, female 

 at left. * Vulva. x5. (After Ransom, Bull. No. 

 127, Bureau An. Ind., U. S. Dept. Agr.). 



