112 



DISEASES OF POULTRY. 



PARASITES OF THE CESOPHAGUS AND STOMACH. 



The Dispharagus spiralis, a round worm about 

 one -third inch in length is found in the oesophagus of 

 fowls. A worm supposed to be 

 of the same species is sometimes 

 found encysted in the connective 

 tissue around the oesophagus, 

 crop, and proventriculus, also 

 in the walls of the intestine and 

 in the mesentery. The Disphar- 

 agus nasutus, a worm about 

 one -fourth inch long has been 

 found in the walls of the fowl's 

 gizzard. Legros reported an 

 epizootic disease caused by this 

 worm in a poultry -yard where 

 several breeds of fowls were 

 kept, of which the Crevecoeurs 

 suffered most severely. The 

 affected birds became emaciated, 

 were dejected, and died exhaust- 

 ed without having lost their 

 appetite. During their last days 

 they were unusually voracious. 

 The gizzard was studded with 

 the Dispharagus nasutus, some 

 of which were entirely hidden in 

 the substance of the mucous 

 membrane, while others were 

 fixed in it by one extremity, 

 the other floating freely in the cavity of the organ. In 

 certain places they were packed together in a compact 

 mass. 



Fig-. 34. — Heterakis perspi^ 

 ciUum. [Ascaris iufiexa,) a 

 male, b, female, x 2. 



