120 ACARINA OR MITES. 



they become sexual adults (b), with a smooth ringed skin, and 

 are vermiform in shape. The males wander about the pharynx, 

 larynx, and nasal cavities, and fertilise the stagnant females, 

 which take up their abode between the turbinated bones and 

 other nasal spaces. One female, according to Leuckart, may 

 produce 500,000 eggs. They sometimes occasion loss, but are 

 not very prevalent in Britain. Dogs should not be given the 

 fresh viscera of sheep, oxen, &c., and then there would be no 

 chance of any such disease appearing in a serious form. 



