Cobb — Nematodes, mostly Australian and Fijian. 39 



near the truncate head. Half-way between the anterior extremity and the lateral 

 organs occur six cephalic setae, each one-third as long as the head is wide. The 

 obscure lips are probably three in number. The lateral organs are unclosed circum- 

 ferences, one-fourth as wide as the head, and are situated opposite the middle of the 

 pharynx; regarded as spirals, the right is a left-handed spiral, and the left a right- 

 handed spiral. The long two-chambered pharynx reaches half-way to the nerve-ring, 

 only the anterior part being referred to in the above formula : the anterior half is a 

 strongly -lined tube, wider at the mouth, namely, one-third as wide as the head ; 

 the posterior half somewhat resembles the remainder of the oesophageal tube. This 

 latter is anteriorly one-third as wide as the neck, but posteriorly narrows to one-fourth 

 as wide as the neck, and finally expands to form an elongated bulb three-fourths as 

 wide as the base of the neck and containing a distinct valve. The transparent 

 intestine, which is two-thirds as wide as the body and rather thin-walled, is separated 

 from the oesophagus by a distinct constriction. The ventral excretory pore is 

 situated opposite the oblique nerve-ring. The two wings of the cuticle found on 

 each side of the body are separated from each other by a distance equal to one- 

 seventh the diameter of the body. The tail is conoid and ends in an apiculate 

 terminus one-third as wide as the anal body-diameter is long. Caudal glands as in 

 other Plecti. The vulva is inconspicuous. The eggs are three-fourths as wide as 

 the body and five times as long as wide ; only one seen and that behind the vulva, 

 unsegmented. The female sexual apparatus is possibly single and reflexed, extending 

 first forward and then back past the vulva. 



Hab. — About the roots of plants, Moss Vale, New South Wales, Australia. 



Genus CEPHALOBUS, Bastian. 



1. O. similis, n.sp. Very likely a new genus may have to be created to 

 receive this interesting little worm, which I found on lettuce from a Chinaman's 

 garden. The only specimen seen, a young female, gave the following dimensions : 

 F 3 i-4 ^4-7 %fi^i-i -a mm. ISTeck conoid; head truncate, bearing six large bluntly conical 

 lips; pharynx deep and complicated, composed of three parts as follows : 1, the part 

 alluded to in the formula as 1 '6 % deep, one-third as wide as the head, fully twice 

 as deep as wide, tapering behind into 2, which is closed and surrounded with a 

 separate muscular layer, but which however has not so great a diameter as 3, which 

 is nearly twice as long as the two anterior parts taken together, more than half as 

 wide as the corresponding part of the neck and contains a narrow elongated cavity 

 in its anterior half ; oesophagus of three parts, with the pharynx forming a structure 

 of the same form as the oesophagus of Rhabditis, i.e., the anterior three -fifths about 

 half as wide as the neck and connected with the rather weak ellipsoidal cardiac bulb 



