392 AUSTRALIAN FREE-LIVING MARINE NEMATODES, 



Found in sand, near low-tide mark. Port Jackson, New South 

 Wales, Australia. 



Terschellingia, De Man. 



3'3 fi'.T tfi 82" 



Terschillingia exilis, n.sp. -g i-5 i-5 re r2 ^^^ '"'"■ 

 The cuticle of this slender species, of which I have seen only the 

 female, is marked with transverse stride resolvable with high 

 powers into rows of dots. The hairs on the body are very small. 

 The short cylindroid neck terminates anteriorly in a rounded 

 head bearing on its front four submedian setae, each nearly as 

 long as the diameter of the neck, and, a little farther back, two 

 somewhat shorter sub-cephalic setpe. Lips and papillte of the 

 usual form are lacking. The distance from the anterior extremity 

 to the front margin of the circular lateral organs is about equal 

 to the width of one of these organs, or to half the width of the 

 head. There are no eyes. About the nature of the pharynx I 

 am uncertain. The casual observer would deny its existence 

 altogether. If, however, one examines the lumen of what appears 

 to be the beginning of the oesophagus, he will soon discover, at a 

 point opposite the anterior margins of the lateral organs, certain 

 obliquely radial markings due to chitinous formations. These 

 appear to be the optical expression of foldings of the lining of 

 the oesophagus. Their position leads one to suspect that all that 

 part of the tube in front of them is capable of being thrust for- 

 ward and turned outward with a view to seizing food. The 

 anterior tubular part of the oesophagus is less than one-half as 

 wide as the neck; posteriorly the oesophagus expands in to a 

 broadly pyriform bulb which completely fills the base of the neck. 

 The lining of the oesophagus is distinct, and the cardia is, relatively 

 speaking, very large. The transparent intestine, which is four- 

 fifths as wide as the body and composed of cells containing a few 

 granules, is separated from the oesophagus by a very shallow but 

 distinct constriction. The rectum is equal in length to the anal 

 body-diameter. The ventral gland is situated just behind the 

 cardia; its pore, apparently, just behind the nerve-ring. The 

 lateral fields are two-fifths as wide as the body. The tail is 



