404 AUSTRALIAN FREE-LIVING MARINE NEMATODES, 



in a slightly swollen and transparent head, which is rounded in 

 front and which bears several inconspicuous organs, among Avhich 

 I notice particularly spiral lateral organs one-half as wide as 

 the head, situated near the anterior margin of the head, and at 

 least four papilla-like cephalic setae, and finally three obscure lips 

 each apparently with four obscure papillge. The right lateral 

 organ is a left-handed spiral of two winds and the left organ is a 

 similar right-handed spiral There are no eyes. The pharynx is 

 minute, cyathiform, obscurely ribbed, and contains a minute 

 dorsal tooth situated near its base. The oesophagus is about one- 

 third as wide as the neck, but expands in the posterior fifth to 

 form an ellipsoidal bulb, not double as in Spilophora, but with 

 a well developed chitinous lining. The cardiac constriction is deep 

 and distinct. The intestine, which is two-thirds as wide as the 

 body, is loosely granular. The ventral gland is situated behind 

 the cardiac region, and empties its excretion bj^ means of a wide 

 duct and elongated ellipsoidal ampulla one-third as wide as the 

 neck, through a pore situated just behind the oblique nerve-ring. 

 The anterior half of the tail is conoid ; thence it continues, 

 cylindroid and one-eighth as wide as at the anus, to the elongated 

 barely swollen sub-apiculate terminus. The two equal, arcuate, 

 elongated spicula are widest in the middle and are not much 

 curved; the full length of the spicula is twice as great as the anal 

 body-diameter, and their proximal extremities are narrowed and 

 recurved. The two simple accessory pieces are one-half as long 

 as the spicula, and are arranged parallel to them. A ventral row 

 of fifteen low, flat, almost confluent accessory organs occupy a 

 space in front of the anus once and one-half as long as the tail. 



It is possible that this worm belongs to a genus hitherto 

 unrecognized; for the present, however, I would prefer to have it 

 classed as a Cyatholaimus with a much reduced pharynx and 

 distinct cardiac bulb. It occurs in sand near low-tide mark. Port 

 Jackson, New South Wales. 



Halichoanolaimus, De Man. 



Halichoanolaimus australis, n.sp. Having seen only young 

 specimens of this animal, I cannot give its ultimate dimensions. 



