406 AUSTRALIAN FREE-LIVING MARINE NEMATODES, 



aljout two-thirds as wide as the neck. Its lining is conspicuously 

 crenate in optical section. The intestine, which is separated from 

 the cesophagus by a deep and narrow cardiac constriction, is 

 three-fourths as wide as the body, and contains in its cells small 

 granules with a tendency to a tessellated arrangement. The post- 

 cardiac ventral gland empties through a pore just behind the 

 nerve-ring; the sub-spherical ampulla is one-fourth as wide as the 

 neck and often presses the skin outward in the region of the duct 

 so as to form a conspicuous ventral elevation. The lateral fields 

 are nearly one-fourth as wide as the body. The nerve-ring 

 encircles the cesophagus squarely. 



The young stages of this worm were found in sea-sand near 

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



Graphonema, gen.nov. 



Graphonema vulgaris, n.sp. I have seen numerous specimens 

 of this handsome and very common worm. It frequents algte 

 and sea-sand along the coast of New South Wales and 

 Victoria Like Graiyhotiema paclLyrlerma, another species to 

 be described later on, and to which it is closely related, 

 it much resembles the species of Chromadora, but lacks the 

 ventral row of preanal male accessory organs and possesses a 

 simple oesophagus without a cardiac bulb. Female formula — 



^ i-fi to 1-8 mm. The middle diameter is very 



1-2 2-1 2-1 3 to 5 -I 



often notably greater in gravid females than in those otherwise 

 equally large but containing no eggs in the uterus The thick 

 cuticle bears very inconspicuous hairs (if any) and is tra- 

 versed by strife similar to those in the case of G. pacKyderma, 

 except that in the present species the markings are not different 

 on the lateral fields nor are the strife so apparently the summits of 

 transverse ridges. The conoid neck terminates in a truncate 

 head, conspicuous because of a slight constriction behind it, and 

 because of the sudden diminution in size on it of the cuticular 

 markings, they being not more than half as large as similar 

 markings near by on the neck. The six cephalic setae opj)osite 

 the apex of the dorsal tooth, and the four sub-cephalic setae 



