STRONGYLID^E 14! 



Strongylns. Common in the domesticated animals. 

 Many of them live in the bronchial tubes, such as 

 Strongylus micrurus, so common in the lungs of cattle in 

 America and Africa. In young animals fatal broncho- 

 pneumonia is caused. Older animals acquire tolerance. 

 S. apri, common in pigs, has been found in man. 

 5. longevaginatus has been once found in man ; and it is 

 suggested that other nematodes found in the human 

 lungs may belong to this group. 



S. subtilis occurs in the human intestine in Egypt and 

 Japan. It is also found in the camel. The males are 

 4 to 5 mm. in length, and anteriorly measure 0*009 mm., 

 but posteriorly, close to the bursa, 0*07 mm. The oeso- 

 phagus is rather less than one-sixth of the length of the 

 body. The copulatory bursa consists of two lateral flaps 

 strengthened by asymmetrical ribs. 



The females are 5*6 to 7 mm. in length and about 

 0*09 mm. in breadth. The anus is subterminal and the 

 caudal extremity tapers suddenly to a slender pointed tail. 

 The genital opening is at the junction of the posterior 

 fifth with the rest of the body. 



Metastrongylus apri recognized by Joitsits in 1845 as a 

 parasite closely allied to the lung parasite of pigs and 

 named by him S. longevaginatus. They were found in the 

 lungs of a boy aged 6 in Transylvania. 



Other Strongylidce found in man mainly belong to the 

 group Sclerostominae. Mouth furnished with a complex 

 chitinous armature. The mouth opens directly in most 

 genera into a dilated portion, the buccal capsule, to which 

 the armature is attached and then opens in the ceso- 

 phagus. The bursa copulatrix is strengthened by ribs. 



The family is subdivided into genera mainly on the 

 varying characteristics of the mouth-parts and of the 

 caudal bursa of the male. 



ANKYLOSTOMIASIS. 



Ankylostomiasis is the disease attributed to the Ankylo- 

 stomum duodenale, or the Necaior americanus, and is a 



