394 AUSTRALIAN FREE-LIVING MARINE NEMATODES, 



ture. The cylindroid oesophagus is two-thirds as wide as the 

 neck and its distinct chitinous lining appears crenate, when seen 

 in optical section. The cells of the thick-walled intestine, which 

 is three-fifths as wide as the body and is separated from the 

 oesophagus by a shallow but distinct constriction, are closely 

 packed with granules. I learned nothing concerning the nature 

 of the ventral gland or the lateral fields. The anterior half of 

 the tail bears short hairs here and there, and is conoid from the 

 inconspicuous anus; thence to the barely swollen terminus, which 

 bears two hairs, it is cjlindroid and one-fourth as wide as at the 

 anus. The eggs are two-thirds as wide as the body and twice as 

 . long as wide. 



2 -1 ? 20- M 85- 



2-2 3-4 3-6 3'6 24 ^ ' °'°'' The tail of the male is much like 

 that of the female. The two equal setaceous spicula, two-thirds 

 as long as the tail, are straight except near the distal extremity, 

 being arranged through the greater part of their length parallel 

 to the axis of the body; their proximse are not cephalated. 

 The two trough-shaped accessory pieces in which the spicula glide 

 are one-third as long as the spicula themselves. I saw no sup- 

 plementary organs, but, as usual, the hairs both before and 

 behind the anus of the male were specially developed. 



This handsome microscopic worm is common among sea-sand 

 near low-tide mark. Port Jackson, New South Wales, Australia. 



Oncholaimus, Bastian. 



^ 1-3 9-6 18- '48'^^ 82- „ , ' 



Oncholaimus pellucidus, n.sp. 1-5 2-1 — 2^3 — 24 — vE ^lismni. 

 The cuticle of this species is quite destitute of strias and bears 

 none but very inconspicuous hairs. Surmounting the conoid 

 neck is a truncate head whose setae are reduced to a circle of six 

 nerve points situated opposite the anterior part of the pharynx. 

 The lips are arranged as is usual in Onchokiimus; I saw no labial 

 papillae. The ellipsoidal lateral organs are one-third as wide as the 

 head and are arranged opposite the middle of the pharynx so that 

 their longest axis lies transversely on the body. There are no 

 eyes. The triquetrous pharynx is about one-third as wide as the 



