Nematodes from East African Hosts. 



219 



seems to be a marked tendency for the ventro-lateral lips to 

 be slightly larger than the dorsal lip. The cuticle is finely 

 striated. There is a pharj^nx, separated from the oesophagus 

 by a constriction and a ventral kink in the lumen. The 

 nerve-ring is situated at approximately the same distance 

 behind the constriction as the latter is from the anterior end. 

 At the posterior end the oesophagus enlarges into a bulb just 



Ficj. 2 A. 



Ventral view of male tail, showing sucker, anus, and arrangement 

 of papillae. 



behind the excretory pore. The lateral fields are very con- 

 spicuous, and consist, as usual, of a single row of large cells. 

 The tail of the male is typical, with a preanal sucker having 

 a chitinous ring, papillae, and spicules of the usual type. 

 There are six pairs of preanal and four pairs of postanal 

 papillae (figs. 2a&2b). The most anterior pair is slender 

 and stalked, not always well pronounced; the next is large, 



