116 DISEASES OF POULTRY. 



Heterakis cotnpressa. Male 2 in. long; female 3^ in. long-;: 

 fowl ; intestine. 



Heterakis differens. Slightly larger than papulosa ; fowl ; 

 posterior portion of intestine. 



Heterakis dispar. Male /4 to % in. long ; female % ta 1 

 in. long ; goose ; caeca. 



Heterakis maculosa. Male % to 1 in. long ; female 1 to 1^ 

 in. long ; pigeon ; intestine. 



Heterakis papulosa. Male )A, in. long; female Yz in. long; 

 fowl, turkey, guinea fowl, goose, and peacock ; casca. 



Heterakis perspicillum. Male 1 to 3 in. long ; female 2^ to 

 5 in. long ; fowl and turkey ; small intestine. 



Strongylus tenuis. Male )i in. long ; female J4 in. long ;, 

 goose ; intestine. 



Trichosoma anatis. Male Yz in. long ; female 1 in. long ; 

 goose; CKca. 



Trichosoma annulatum. Male % in. long ; female 3 in. 

 long ; fowl ; intestine. 



Trichosoma collare. Male Yi in- long ; female Yi ^o Y in- 

 long ; fowl ; intestine. 



Trichosoma longicolle. Male J^ to 1 in. long ; female 3 in. 

 long ; fowl ; intestine. 



THORN-HEADED WORMS (ACANTHOCEPHAI^A). 



Echinorhynchusfilii.ollis. Male Yi in. long ; female >i to \Y 

 in. long ; duck ; intestine. 



Echinorhynchus polym-orphus. J/fe to 1 in long; orange-red,-; 

 duck and goose ; intestine. 



Echinorhynchus sphcsrocephalus. % to % in. long ; duck ; 

 intestine. 



Symptoms. — The symptoms which indicate the ex- 

 istence of worms in the intestines are not very charac- 

 teristic, but are such as would be expected from ill- 

 health due to any chronic disease. The birds become 

 dull, weak, emaciated, isolate themselves, are indis- 

 posed to search for their food, are stiff in their walk, 

 their pluma<fe loses its brilliancy and becomes rough, 

 they have diarrhea and sometimes epileptiform attacks. 

 In certain cases the symptoms develop rapidly and 



