xin, D, 5 Wharton: Nematode Parasites 221 



in the lumen of the proventriculus or with one end buried in 

 the duct of a gland. On account of their small size they are 

 difficult to find and also seem to be much less numerous than 

 the females. It is probable that they die after fertilization 

 is accomplished, as I have never found any males in chickens 

 in which the females appeared to be old. 



Host. — Tetrameres fissispina has been reported from the mud 

 hen (Fulica atra) , the duck {Anas boscas), and the chicken 

 (Gallus domesticus) . Since receiving the specimens from Pro- 

 fessor Banks, I have examined 100 chickens here in Manila and 

 have found this parasite in 76 of them. It is by far the com- 

 monest parasite that I found. I have not had the opportunity 

 to make examinations of ducks to see if it is also found in them. 



Pathogenicity. — None of the chickens examined by me have 

 shown any gross pathological conditions that could be traced to 

 the presence of the worms in the walls of the alimentary canal. 

 However, I believe that the presence of these worms, particularly 

 in young chickens, must undoubtedly interfere with the secretion 

 of the glands and result in a general lowering of the vitality 

 of the infested individuals. 



