ANGUILLULID^ FROM TROPICAL ORCHIDS. 83 



transparent, so that it remained impossible to distinguish 

 distinctly their contours. These lateral lips (PI. Ill, fig. 

 2 b) are considerably higher than the lips of the dor so- 

 ventral pair, and project, therefore, slightly beyond them ; 

 their outer wall is slightly convex, and their anterior 

 margin seemed to be concavely emarginated. The reader 

 will do well to consult the drawings on Plates III and IV. 



The mouth leads into the pharynx, which seemed to be 

 cylindroid ; it is 22 /x long in the male, 24 — 26 /x long in 

 the female, and the two lines of its longitudinal optical 

 section run parallel. The pharynx appears nearly eight 

 times as long as it is broad, including the wall. According 

 to Cobb, the pharynx should be ten times as long as it is 

 broad, but I presume that he did not include the wall. 

 The length of the pharynx measures thus nearly one-fifth 

 of the distance between the posterior extremity of the 

 oesophagus and the mouth. The oesophagus (PL III, 

 fig. 2) has the same form as in most other species of 

 Bhabditis. The foremost part, between the pharynx and 

 the median bulb, is 29 — 30 n long, slightly longer than 

 the pharynx, and nearly three times as long as it is wide. 

 The next part, the ellipsoidal median bulb, is little more 

 than half as long and about as wide as it is long. The fol- 

 lowing portion, between the two bulbs, has about the same 

 length as the pharynx, but it is nearly twice as wide ; 

 this portion is also half as wide as the median bulb. The 

 posterior bulb is 22 /x long, and spherical ; it is accordingly 

 a trifle shorter than the pharynx, and does not yet 

 measure one-fifth of the whole length of the oesophagus, 

 the pharynx included. The wall of the oesophagus con- 

 tains the usual muscular fibres, and the chitinous valvular 

 apparatus is well developed. The ventral excretory pore 

 is situated opposite the latter. 



Though very many female individuals were found in the 



