METASTRONGYLIN^ 261 



with Metastrongylus apri sometimes occur with high mortality among 

 pigs. Such cases take a course similar to that in sheep and calves. In 

 the milder cases there may be disturbances of nutrition and occasional 

 cough, though usually in light invasions nothing is observed to cause 

 suspicion of the presence of the worms which are only revealed on 

 examination of the respiratory passages after slaughtering. 



For Post-mortem Appearance, Development and Etiology, Control, 

 and Treatment, refer to pp. 262-265. 



Bronchial and Pulmonary Strongylosis of the Horse 



Dictyocaulus amfieldi (Strongylus arnfieldi). — Metastrongylinse 

 (p. 256). — The body is white and filiform and the mouth is nude. The 

 bursa of the male is short, with faint lobulation. The spicules are 

 slightly arched, 200-240 microns in length, and have a net-like marking. 

 The tail of the female is short, slightly curved, and terminates in a 

 blunt point. The vulva is situated somewhat posterior to the middle 

 of the body and is not prominent. 



Length of female, 4.3-5.51 cm. (1 11/16-2 3/16 inches); male, 2.8- 

 3.6 cm. (1 1/8-1 7/16 inches). 



The eggs are oval and measure 80-100 microns in length by 50-60 

 microns in breadth. They contain developed embryos at the time they 

 are deposited, and these are liberated in the respiratory passages of the 

 host. 



The hberated embryos measure 400-490 microns in length and have 

 a thickness of 14-18 microns. 



The worm is parasitic in the bronchi of the horse and ass. 



Bronchial strongylosis of equines seldom occurs. Clinically it is 

 manifested by symptoms similar to those of verminous bronchitis in 

 other animals. 



For Post-mortem Appearance, Development and Etiology, Control, 

 and Treatment, refer to pp. 262-265. 



Cardio-Pulmonary Strongylosis of the Dog 



Haemostrongylus vasorum (Strongylus vasorum). Metastron- 

 gylinse (p. 256). — The body is filiform, whitish or reddish in color, and 

 has longitudinal striations. The mouth is nude. The bursa of the male 

 has two lobes, each sustained by four ribs. The vulva of the female 

 is situated in front of the anus. 



Length of female, 18-21 mm. (3/4-13/16 of an inch) ; male, 14-18 mm. 

 (9/16-3/4 of an inch). 



The eggs are oval and measure 70-80 microns in length by 40-50 

 microns in breadth. Segmentation occurs after they are deposited. 



