114 



DISEASES OF THE RESPIRATORY ORGANS. 



discharge is very profuse and there is more or less disturbance of 

 the general system. When the catarrh is confined to the anterior 

 chambers the nasal cavities are often very much contracted and 

 we hear a snuffling nasal bruit ; and if the chamber is very much 

 contracted we may see dyspnoea, and the animal is compelled to 

 breathe through the mouth. This is apt to occur more in those 

 dogs that have narrow, twisted, or curved nasal chambers, as in the 

 case of the pug and bulldog. True bleeding of the nose (epis- 

 taxis), or mucus streaked with blood, is very seldom seen. The 

 duration of a case of nasal catarrh is about a week; we may, how- 

 ever, occa'sionally see a case where there is a tendency to a chronic 

 condition; in such a case the secTction becomes purulent and has 

 a tendency to dry around the nose, forming dirty crusts around 

 the nostrils and the upper lip. In very bad cases the secretion 

 is purulent, with a very bad odor, and in rare instances streaked 

 with blood. This is specially the case where the pentastomiim 

 tsenioides {Linguatula tcenoides) is the cause of the diseased condi- 



Fro. 36. 



Fir. .37 



Pentastoma tenioides. Peutastoma denticulum. 



tion of the mucous membrane. This tsenia-like parasite, which 

 belongs to the class of arachnides, has a flat, curved body which 

 is indented at its borders, and fitted with hook-shaped claws, which 

 can be extended forward, and between them it has a buccal orifice. 



