36 The Management and Diseases of the Dog. 
and especially inhabits the nasal sinuses, etc. Obstruction 
more or less marked is the consequence of its presence in 
this region. 
“‘Chobart first discovered it in the frontal sinus of the 
horse and the dog. He confounded it with the teenia, and 
christened it the tenia lanceole. 
~ “Blanchard examined many dogs without finding it, and 
states that the helminthological collection at the Jardin des 
Plantes contains only two specimens. It has been found in 
dogs in different parts of the Continent, and also in other 
animals. Leuchart introduced the Pentastomum denticu- 
latum of the rabbit into the nostrils of a dog, where he 
afterwards found the Pevt. tenzordes. He concludes that 
the former, which lies encysted in the viscera of several 
species of animals, is the larval form of the latter. He 
states that mature ripe eggs are thrown off from this para- 
site, and discharged with the nasal mucus of its host in the 
act of sneezing. These embryonic forms manage some- 
how or other to get introduced into the bodies of other 
animals, where they become fully developed. Fiirstenberg 
has found the immature or a sexual form in the mesenteric 
glands of the sheep, as developed from the eggs of this 
parasite, which are swallowed by the sheep with its food. 
When a dog or wolf eats the entrails and mesenteric glands 
of such sheep, the embryonic parasite sticks to the nose’ 
and lips, and afterwards passes up the nostrils, where it 
becomes firmly fixed by its hooks. Here the embryo 
gradually increases in size, is endowed with sexual organs 
in about two months, and attains its full development in 
twelve. Colin introduced fifty immature parasites into a 
Newfoundland dog. Eight months afterwards the dog was 
killed, and eleven mature parasites, nine males and two 
females, were found in the ethmoidal cells and about the 
turbinated bones. The males moved about; the females 
were fixed by their hooklets to the pituitary membrane, 
and had their copulative sacs filled with spermatozoa, and 
their oviducts crammed with eggs. 
