new Siamese Nematode. 



413 



doubles and runs forward, bending back once more at about 

 the level of the vulva. The folds of the ovary corresponding 

 to the anterior uterus appear to lie entirely in front of the 

 vulva, forming a conspicuous loop at the anterior limit, about 

 1*4 mm. behind the oesophagus. The ovary corresponding to 



Fig-. 5. 



A.R 



Falcaustra siamensis. Tail of male, ventral view, 

 Lettering as in fig. 3. 



the posterior uterus runs forward and also makes an anterior 

 loop at about the same level as the other, then runs straight 

 back to terminate in the posterior region of the body. 



The ova are large, oblong-oval in shape, with a thick shell 

 marked externally with a fine granular pattern. They are 



