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 taenia, and 

 christened it the tcznia 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 Pentastomnm denticii- 

 latum of the rabbit into the nostrils of a dog, where he 

 afterwards found the Pent, tenioides. 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 booklets to the pituitary membrane, 

 and had their copulative sacs filled with spermatozoa, and 

 their oviducts crammed with eggs. 



