ENTOZOA IN THE AIR-PASSAGES. 59 



Chapter II. 

 ej^^tozoa eotjnd in the eespieatoey passages. 



The respiratory passages in many animals furnisli 

 a habitat for certain species of worms, and numerous 

 examples have been observed amongst mammiferse, 

 birds, and reptiles ; but our present knowledge con- 

 cerning the entozoa which exist in these situations 

 in man is very limited. 



The entozoon, described by Treutler as the 

 Hamularia lymphatica, was found in the bronchial 

 ganglia, and not in the air passages themselves ; 

 besides which the existence of this worm as a dis- 

 tmct species must be considered very doubtful. 



Another entozoon, the Strongylus longevaginatus, 

 which is supposed by some writers to be similar to the 

 Hamidaria lymphatica, has been once observed in a 

 boy's lungs, from which several of these small nematoid 

 worms were taken after death ; some of the worms 

 appeared to be imbedded in the lung-substance, 

 wliilst others existed in a free state in the rami- 

 fications of the bronchi. 



Nematoid worms in the larval condition, which 

 cannot consequently be referred to any known species, 

 have been found in a state of freedom in the human 

 larynx and trachea. These worms were still alive, 

 and in such numbers that it cannot be supposed that 

 they were only the result of an accidental migration 

 from elsewhere. 



These entozoa, of which an account has already 

 been given, under the head of Nematoideum tracheale. 



