new Siamese Nematode. 



409 



(fig. 1, Oes. 1 .) is slightly longer than broad, and has a 

 thick cuticular lining. The posterior division (fig. 1, Oes. 2.), 

 or oesophagus proper, bears an oval swelling just in front 

 of the posterior bulb, the swelling and the bulb together 

 corresponding to the hourglass-shaped third portion of the 

 oesophagus described by Lane for F. falcata. There is a 



Fur. 1. 



Oes. I 



Oes. 2 



Faleaustra siamensis. Dorsal view of head and anterior part of 



oesophageal region. 



B.C., buccal cavity ; C.R., cuticular ring ; N.P. 1., outer branch of pulp 

 of papilla ; Oes. 1, Oes. 2, anterior and posterior portions of 

 oesophagus. 



considerable dilatation of the intestine at the point where 

 it joins the oesophagus. 



The cervical papilla? are very small, but prominent, nipple- 

 like organs, situated at about the middle of the oesophageal 

 region, and therefore at a considerable relative distance from 

 the anterior end. The excretory pore, as in F. falcata, is 



